I use a Synology nas which has official support for docker / docker-compose to run my arrstack and has n+2 btrfs redundancy. Then for running Plex and jellyfin I use an Intel nuc10i7 with quick sync with the nas media folder mounted over the network but using a direct gigabit link between the 2 so that the traffic stays off my switch.
I could have gotten away with doing it all on the nas if I forewent ECC in favor of quick sync, but my first priority with my nas is keeping personal artifacts safe so I went with ECC.