Question about Trendnet Tv-Ip314pi

I run two 314PL's and two 310PL's outside my home, and I power them with the Linksys POE switch. I don't know very much about this Devolo system, but from what I understand, that delivers LAN to locations around the house or office. Personally, I would just with the injector. You run the LAN cable to the inj., then to the camera. The injector just adds power to two unused wires in the Cat cable to power the camera.