As background.... I'm using a Netgear range extender to feed my Streamer (and 2Tb HDD) unit and that has worked well for years. There's not much else working off the range extender so it has plenty of bandwidth for the streamer.
As far as audio quality.....I recently read that it is important to use a well shielded Ethernet cable from the extender to the streamer to reduce noise from the nearby electronics. That led me to upgrade the Ethernet cable to a nicely shielded DH Labs Silver Sonic - Reunion Cat8.
Before I put in the new ethernet cable both streaming and locally stored music (all .wav) both sounded nice and about the same, but now the Reunion has made the streaming a more lively experience - especially on the higher bitrate streams (192k+) streams.
Good luck with however you solve this!