The issue IMHO isn’t noise via network but noise via the AC line, and potential for surges coming in from the cable line unless it’s fiber already.
For power supply issues I use iFi supplies like these.
For surges I have one of these outside and then use Ethernet to fiber adapters to put a 1 meter air gap between the cable modem and my router. I live in a lightning prone area where lightning did enter several neighbors homes the first year I was here, so I'm more nervous than most.