//SARCASM-On
If you’re inclined to believe in anecdotal audiophile myths and want to extract the ultimate essence from your „resolved“ system, you owe it to yourself to get something along the lines of a WADAX Atlantis, and isn’t then any superfluous non-audio-related computing task pure heresy, like monitoring tasks and threads to put the thing to sleep on inactivity!?
SARCASM-OFF//
Now, really, just get any capable computer device, NAS, MAC, PC(Windows or Linux) with as high as possible base, as opposed to turbo speed, with as many physical cores as you’re planning to have zones running concurrently (double that up if you’re ever planning to do any DSD processing with parallelized delta-sigma modulators), directly attach a USB disk with your music files and set it up away from your audio systems.
That link in the “audio“ chain is only processing data and really has no impact on ultimate sound quality.
If you want audiophile „noise“ isolation for your primary system get a Roon Ready network streamer that ticks your preference boxes to feed your DAC.
For additional „non-critical-listening“ zones, get cheapish RaspberryPi‘s or other supported single board computers or prefabricated streamers that output accordingly to the respective digital or analog device, and you’re done.
And to my knowledge, none of the possible Roon server variants may ever go to sleep, since neither Roon nor most connected end points can gracefully recover as of yet.