The short answer
The number of camera towers depends on coverage goals and verified sight lines, not acreage alone. Important factors include the shape of the property, obstructions, elevation, entrances, high-value areas, lighting, required image detail, camera field of view, blind spots, network coverage, and whether the goal is general deterrence, detection, identification, or documentation.
What to know
Begin with a site plan and mark priority zones, likely approach routes, assets, gates, and areas where incidents have occurred. A qualified assessment should test actual views at the planned mounting height and at night. Buildings, containers, trees, vehicles, dust, glare, and changing construction can block or degrade coverage. Overlapping views may be useful at critical locations, but more towers do not fix poor placement or an undefined response plan.
Also decide what happens when activity is observed: who monitors, who receives alerts, whether an officer or manager responds, and when police are called. Arrow should provide a placement proposal identifying each tower’s purpose and known limitations. Review placement after site changes. No exact number should be published or quoted without the current equipment specifications and a property assessment.