I have no idea if this is any good but I remember thinking it's a pretty decent idea for couch gaming. Not cheap though!
http://www.razerzone.com/gaming-controllers/razer-turret
http://www.razerzone.com/store/razer-turret
Would the official Ubiquiti injector work?
https://www.amazon.com/Ubiquiti-Networks-0-5A-GigEthernet-POE-48-24W-G/dp/B00HXT8MNI/ref=pd_sim_147_3?ie=UTF8&dpID=51zDKkuqVwL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&psc=1&refRID=Q3A0BDS0R82WG1FRDM41
Official reseller:
Ubiquiti Networks 48V PoE...