For this guy's house we have the NVR in the living room with a 28" monitor so he and wifey can see what's going on in the yard or on the porch. From a security aspect that's not the best idea as bad guys will see it, take it, and tada no video evidence! But that's what they wanted.
There is a
cat5e cable running from the NVR to the POE switch in the basement. Be aware that the $49 switch has 4 POE and 4 NON-POE ports. All of the camera cables terminate at the POE switch. Two cameras (FrontPorch and BackYard) use the POE ports and the other two (Garage1 and Garage2) are connected to the switch that is connected to the Powerline Adapter in the garage. The other end of the Garage Powerline Adapter uses one NON POE port on the switch.
There is a final cat5e cable running from the POE switch to their Comcrap router. Technically this still gives him a bunch of unused POE ports on the NVR and 2 POE ports on the switch, so depending where he wants his next camera, we got options.
I would go for the NVR8-7400 or later as this is newer and has 4MP cameras. Also, I'm going to assume you will use the mobile app so be sure to use the QR code for setup as it's much less of a pain in the butt than playing with dynamic IP services.