RP-PN8/16 NVR IP Cam Question

Regarding the RP-PN8 and RP-PN16 Professional NVRs…..the compare feature button indicates 12 and 24 max cameras respectively (8 wired and 16 wired). My question is the description is different on the professional series in that for the additional cameras is says IP cameras vs the regular series NVR which say WiFi cameras. Is there a difference and does this mean a POE cam connected to the network with a POE injector switch would record to the NVR in addition to 8 or 16 POE cams powered by direct connection to the NVR? I’m going to end up with 10-11 cams but 3 will be in/on a detached garage connected to the main network through a switch via Ethernet cable. If I can get away with a 8 channel and still get those cams to record to then R that would be cheaper.