I have the 8400T with 16 gigs of ram. Most of the same apps but also a home assistant VM and frigate. Cou usage is between 6 and 12% typically, I think it hit 30 once

Flag a warning when usage hits 5% so you can start saving for the next server

16 runs fine for me. I transcode to an SSD and run home assistant and airsonic and emulatorjs and immich and frigate and monitoring software like glances and uptimekuma and and and.

Ram is at 70%, could use more, 8 isn't enough but 16 will get you going