Another vote for Synology here. I previously had a DS418play for almost 8 years. Just picked up a DS423+ recently to upgrade and the process was literally as simple as removing the drives from the old NAS, chucking them in the new NAS, and booting up. All my Docker containers, all my credentials, all my licenses were all just there and working, despite being in a new shell.
With the removal of the Tidal API from Plexamp, I will be sorely missing my discovery recommendations. Will need to give this a shot using Last.fm scrobbling (already supported in Plex).