Chiming in to say I also run an n150 with mostly the same software. It does fine. Storage is 50tb of old server HDD so pretty cheap.

I ran an n100 until last week. Worked fine.

I have plex setup to transcode and it serves about 10 users just fine. My plexamp sonic analysis took like 4 days though, lol, but everyone says it takes forever.

My immich import took about 20 hours? So not bad.

I run all my home automation off it. 100+ devices, logging, etc. no issues.

I also sometimes run an OBS stream on it to transcode for YT. The n150 does fine.

Total cost for me is about $550. I saved a lot on HDD by going used server drives. $140 for the n150, $300 for drives, then a cheap UPS and router running openwrt.

As for difficulty, most of this is deployed in a few minutes using docker or install scripts. The hardest part is the choice between various solutions.