I am looking for camera’s that are PoE preferably and the ADC-VC726 and ADC-VC826 to be the only PoE models but not sure if they are older models.
This thread lists out compatible POE models. There are more than those two.
On the WiFi cameras, can the power supply be wired remotely to say a central location.
You can use 18AWG cable to extend the power cable and run them to a more convenient location, yes. Or you can find pre-terminated DC extension cables. Options will depend on how far the cable needs to go.
Surety Plans, how many cameras and SVR’s can be added to the account? Which plans/add-ons would be needed?
A breakdown of plans and included features are shown here, including the various video add-ons. Complete is a good place to start, with support for 4 cameras, 1 SVR, 3000 monthly clips. Additional levels of video can be added, each adding 4 cameras and 5000 clips.