One large unit or two small ones?

The question behind the question

Almost everyone arrives at this decision as a budget question — two Minis or one PTZ Pro, which is the better use of the money. That framing produces the wrong answer about half the time, because the two configurations are not substitutes. They fail differently. One unit fails by not being able to see around something. Two units fail by neither one having the optical reach to identify what they see.

The useful first move is to stop comparing price tags and walk the site with one question: from the single best position on this property, can a camera at roughly twenty feet see every place somebody could approach the things worth taking? If the answer is yes, the debate is over and one unit wins. If the answer is no, adding a second position is not an upgrade, it is the requirement, and a bigger single unit does not change the fact that a wall is in the way.

Height helps more than most people expect, which is why the answer is yes more often than site managers guess. A mast at eighteen to twenty feet sees over stacked material, parked trailers and temporary fencing that would completely block a camera at eight feet. Before assuming a site needs two positions, check whether the obstruction is genuinely structural or merely tall.

When two smaller units win

Two positions are the right answer when the site is geometrically split. An L-shaped property where a building occupies the corner is the classic case: no single position sees both legs, and any unit you place is watching one of them perfectly and the other not at all. The same is true of a long, narrow yard where distance rather than obstruction is the problem, since even a good camera loses useful detail across several hundred feet of gravel.

Two separated entrances is the other common trigger. If vendors come in one gate and the crew comes in another a few hundred feet away, entrance coverage — which is where most of the value is — cannot be done from one position. Two Mini towers at $695 per month each, one on each entrance, deliver more usable security than one premium unit watching a single gate beautifully while the other stands unobserved.

There is also a redundancy argument that experienced yard managers raise and that we think is legitimate: two positions mean a fault, a tamper or a blocked view at one does not blind the whole site. It is not the primary reason to choose two, but it is real and worth naming honestly.

• A building, berm or stockpile permanently breaks the sightline
• Two entrances separated by more than a couple of hundred feet
• A long narrow site where distance, not obstruction, kills detail
• Phased work where half the site activates months after the other half

When one larger unit wins

One unit wins whenever the site is a single open area with a workable central or corner position — which describes most single-building construction projects, most contractor yards and a great many dealership lots. On that geometry a second unit is duplicated coverage, a second setup fee and a second thing to maintain, for very little additional visibility.

One unit wins decisively when identification matters more than breadth. Four fixed cameras tell you a person was there; a PTZ camera can zoom on the far side of a yard and produce the kind of detail that distinguishes an intruder from your own night-shift operator, or a plate from a smudge. If your requirement is to know who rather than to know that, spreading the budget across two smaller units buys coverage you do not need at the cost of the optical reach you do. That is the specific case for the SiteFortress PTZ Pro at $1,695 per month over two smaller positions.

There is an honest operational point here too. One unit is one relocation, one power system, one connectivity path and one set of detection zones to keep tuned as the site changes. On projects that move material around constantly, the overhead of keeping two units correctly configured is real, and site teams do sometimes let the second one drift into pointing at nothing.

How the costs actually compare

Two SiteFortress Mini towers bill at $695 per month each, and each carries its own one-time deployment fee of $299 — both waived on a six-month agreement. One SiteFortress PTZ Pro is $1,695 per month with a one-time $699 deployment fee on the same waiver terms. Two Minis therefore land somewhat below a single PTZ Pro in monthly cost, which is the comparison most people run before they walk the site.

The comparison that gets missed is against the middle option. A single SiteFortress 360 at $995 per month sits between them, and on a site with one workable position and no need for zoom identification it is very often the correct answer that nobody considered, because the conversation started as a two-way choice. Before deciding how many units, confirm which unit.

The costs that change with unit count are worth listing plainly, because they are not on the headline rate: a deployment fee per unit, a relocation per unit when the site moves, two sets of detection zones to configure and re-tune, and two power systems whose health you are tracking. None of those is large. Together they are the reason to choose two positions because the geometry demands it rather than because two sounded like more security for the money.

How we decide it on a site walk

The site assessment is deliberately boring. We walk the perimeter and mark where a person could enter on foot and where a vehicle could enter, because those are the events worth detecting. We identify what is worth taking and where it lives, since coverage should be weighted toward the material and the equipment rather than spread evenly across empty ground. Then we stand at each candidate position and check, at mast height, what is actually visible and what is not.

If one position covers every approach to everything valuable, we recommend one unit and we will tell you which one — often a smaller one than you expected. If no single position does, we say so and explain exactly which approach goes uncovered by the one-unit configuration, so the second unit is a decision you make with the gap named rather than a sale. Sites that change shape as work progresses sometimes start with one and add a second when the far half activates, which costs nothing extra in the meantime.

The commitment that makes this work is that every price is published before the walk, so the recommendation cannot quietly drift toward the bigger number. You can read the rate for each configuration before anyone comes out, which means the only thing left to discuss on site is what your property actually needs.

Frequently asked questions