I use a Synology NAS and converted my old INTEL NUC to a Roon Rock. I didn't shell out the 499, but decided to do the 120 per year to give it a full test. I think it is a great app and provides liner notes and artist info that otherwise I would never see when streaming. I do wish they developed an APP for Apple TV to stream the current song's info.
For endpoints I use my Sonos connects and I have one ultra Rendu I bought to experiment with Hi-REZ files from Quboz and Hi-rez downloads. I am not sure the Hi-Rez files by themselves are worth it, but found to be very recording dependent. Quboz didn't have enough of the titles I wanted and too few Hi-Rez. I am using tidal, but will eventually cease once I fill in my library with a few genres I neglected for many years - mainly early punk and progressive rock.
I am curious on the Innous - if that is tremendous improvement over NAS to DAC, or NAS, to Ultra Rendu to DAC. I am guessing marginal, but I am nonetheless curious. Just a lot of money to drop.