For anyone looking to power their cams but no outlet close or 20ft USB cable isn’t long enough either, I am powering some other brand cameras with ethernet.
What I did was ordered USB to RJ45 adapters (one end male USB and the other adapter end female usb) and some ethernet cable. I’m currently using 75ft Solid copper cable. The cheap Aluminum Clad Copper ethernet cable has too much resistance/voltage drop.
Just run the first USB RJ45 adapter from a power brick or USB outlet to the ethernet cable, cable to second RJ45 adapter and plug a USB cable and cam into that and you are good to go.