You should investigate one of these, I installed one in my system between my router and the switch that powers my receiver and Apple TV and other streaming devices. I noticed a very distinct difference. Sound was clearer, probably due to background noise being eliminated that I couldn’t even hear. I felt it was well worth the cost.
SilentPower LAN Purifier Pro
Fiber Optic Cable
So, my provider installed fiber optic cable to my house yesterday. Not only is my TV picture much clearer, but my streaming audio is better quality as well. My modem/router goes via ethernet into my Apple TV and I use Apple Music to a WIIM Amp via optic cable into vintage floor-standing JBLs. I'm sure there are better DACs out there, but it sounds pretty good to me.
PS...I know this is an audio site, but Apple TV is fantastic.