I’m sorry, I have no idea why they would tell you that the Planet PoE converter would work.
Our sPoE cameras receive power through 2 pins, 1(-) and 6(+). Pins 2 and 3 are used for data.
That injector transmits power on 4 pins 4,5(+) and 7,8(-).
Basically the power coming from that injector would be going to all of the cameras unused pins, so it wouldn’t do anything.
Generally there isn’t any need for an injector.
You can run the cables up to 250ft from the Zmodo repeater to the cameras. For longer cables, you can use a coupler, or a patch panel to connect the standard CAT5/6 to the camera cable.
You can also run the ethernet cable 250-300ft from the router to the Zmodo repeater.
Also, the cameras won’t have any problem being connected through a switch, but connect the NVR directly to the router. If the NVR is connected to a switch, you will eventually run into problems.