I use fiber ethernet between my server and DAC.
It runs through a wall near the power cable to the light switch, along the floor past the power cables for the AVR, around to the front of the room and along the power cables for my monoblocks, DAC, preamp etc.
Having used both very high quality ethernet in CATs 5, 6, 7 and fiber, with the only difference being 15m of cable, the perceived quality difference is astounding.
yes, that is "in absolute terms."
Even WiFi had better sound quality than ethernet in my situation