As a follow-up to resurrect my thread from several years ago, I just recently built a Roon endpoint using an Intel NUC8i3BEK kit, added 8GB of memory and a small M.2 SSD to it, and installed Roon's ROCK system.
Very straightforward for around $300 total, and I'm getting high-resolution (up to 192K) transfer from Roon to my HT receiver via HDMI. I can also now use multi-channel audio for the first time.
Roon works OK with my Squeezeboxes, as well, but it's forced to downsample some of the high-resolution audio files. Not with the new unit that I built.
So at the moment the combination of Roon (hosted on my Linux server where Logitech Media Server used to be) and a home-built Roon endpoint using an Intel NUC purchased off Amazon is my current solution to streaming audio.