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First you need to determine what power and network options are available in the locations you want to install the cameras. Do they have access to the network via WiFi? Of course, hard-wiring is preferable to WiFi, but you may not have easy access to wired ethernet drops. If wired ports are readily available, consider powering the units with PoE.
Beyond advice to start with solving the network connectivity problem first, I'm not up to speed on which systems are well regarded. I suppose the next question is whether pan and tilt functions are needed? Then figure out what field of view you need. Lenses are often swappable to create larger or smaller fields of view.
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