I have a nvr that I need to get internet to that is 520ft away with an underground cat 5e cable. I purchased a POE extender but it did not work. I do not have the ability to plug something in, halfway in the field. I was told I need and EPOE injector but I can not find one. I need to go router>injector>extender(which is nearly exactly halfway through my run installed already)>NVR for internet connection. Can I just get a regular old POE injector plugged in right at the router? Or do I need EPOE? Either way, it’s going right where the router is and it’s not a fancy one just a regular old internet company installed router. As I understand it if I have a switch it needs to be at least 325ft away from the router. Please provide a link and from Amazon if possible!! Thank you !!