There is so much to read, as there are as many different views and opinions. It goes from adding a single Uptone EtherRegan (eR), to chaining a couple of Cisco's (Meraki, 2960 or SG100D) to SoTM's and Bonn's in the wildest configurations.
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I’m like a broken record as I keep repeating this so please bear with me. There’s a limit to how good a switch can be. The best sound of a switch is no switch, the sound without LAN. So if it’s possible to hear your system without the LAN cable attached that’s the target sound.
It’s possible if the playback software fully buffers the music prior to playing. Pink Faun’s Euphony software does this. You’ll loose playback controls while the LAN cable is disconnected but you’ll be able to hear the ultimate switch sound - nothing.
Obviously this is not suitable for normal listening but it’s good for seeing how much distortion the LAN is actually adding to your system.