This. I did extensive research and will get myself a n100 or n200 for my on-prem server. Itcaps out at 16 GB ram, but I'll survive. N305 has 3x the power consumption as n200 at around 15W. Asrock even has a mITX mobo for the n100. And its fanless!
RPI5 would be the other obvious choice, but it's impossible to get a hold of.
Edit: Also, check out this thread: https://discuss.tchncs.de/comment/2340730