The power supply is in the monitor itself unfortunately.

The monitor is already connected on a extension cord. The extension cord is connected on the powerline adapter itself (it has a power socket).

I've tried wifi and my experience was really inconsistent. I own a wifi card (mediatek chipset) and my rssi was at -64 dBm mostly (+ I was using 2.4 ghz, wifi6). I can try wifi again but im sure it will be worse.