It doesn’t need much RAM, my file server/jellyfin server runs on an old laptop I just have sitting with the lid closed on a desk near my router. I RustDesk into it for anything I need, and I have a split VPN tunnel running at all times, so anything I acquire goes through another IP.
(Had a 256gb SSD laying around I put in it for the OS, and 2 1tb USB hhd’s hold media). Jellyfin runs on both our cheap Roku TV’s, and our phones if we ever wanted)
I thought HDMI to Ethernet to HDMI was cool the first time we had to do it for a project in a large room. Hdmi starts running into issues at around 25-50ft. You can go a lot further with the Ethernet cable