I’ve got a BeeLink N100 system that’s just a bit bigger than a NUC, has two 2.5Gb LAN ports and came with a 512gb nvme drive. Works a treat as a Jellyfin server with TONS of processor and ram headroom. N100 is a great little chip, so long as you’re not expecting i5+ power.
You can use it as a firewall/router or a VPN gateway and even slap a wireless NIC or two on there and make it a combo router/AP, which can simultaneously play and transcode video as a Plex/Jellyfin server with zero hit to networking performance.
Note to anyone heeding this advice: it has to be a metal water pipe, no plastic.