If you are considering getting some really cheap N100 computers or Raspberry Pi 5 boards to set up a relatively low power homelab, you may want to consider looking at Dell Wyse 5070 thin clients with a J4105 or J5005 processor.
They are passively cooled, use a laptop power brick, support up to 8 GB of RAM, and use an M.2 SATA drive (not NVMe) and can be stood vertically or sat horizontally.
Since companies are phasing them out, you can find lots of 5, 10, 25+ on eBay and other corporate off-lease auctions for around $30-45 each.
Getting FreeBSD, Debian, Fedora, NixOS, Arch or any other distribution on them is pretty darn easy. As such, Proxmox is also an option for lightweight containers.
There are some minor tweaks to the firmware settings to allow fwupdmgr to update the firmware version properly (otherwise, use a USB boot drive).
Sure, they are bigger than most N100 or Pi 5 with a case, but the thin clients are sturdy AF and you don't have to worry about fly-by-night sellers hawking N100 systems.
HP thin clients would also work, but I haven't used them before as a homelab server.