Ethernet source

I'm trying, somewhat desparetely, to improve the sound quality of streaming which presently I wouldn't even say is up to cd quality, even though I,ve been streaming hi-res files on qobuz.  My streaming device is a Sonore ultrarendu.  I,m limited in terms of Ethernet access where my system is located.  I,ve been using a net gear power line device to obtain Ethernet off of 120v circuitry.  There is, however,
an Ethernet port on my tv cable box.  Would I be better off using that as opposed to the net gear?