In general, you don't want DC or Ethernet cabling directly next to AC wiring. I forget the exact rules and distances, but you definitely don't want them in the same conduit at least. Shielding only helps so much. Just a general note as you probably didn't mean it quite so literally...
I do like PoE though! I have a server rack that powers a bunch of RPi 4s through a PoE+ switch. Had to make sure there was plenty of headroom as RPi 4s can pull just a wee bit of current under full load. I am just happy it works at all.