Good streamers completely isolate the signal electrically and cache the bits. So, it does not matter how good or bad your network is. I run my Aurender streamers from extenders. Changes in extenders, cables and ethernet regenerators have no effect on the sound quality. A red book CD, stored file or streaming sound exactly the same... as does vinyl.
Cheap streamers can achieve better by improving the whole network... but it requires improving stuff that is only important for your audio system and becoming an IT guy. Much better just to purchase a good quality streamer.