Comment by seanlane

If you're feeling a little adventurous, you can find Intel N100 boxes with 4-6 NICs: https://forums.servethehome.com/index.php?threads/cwwk-topto...

Went down this route and haven't had any issues with heat or having to replace heatsinks, add fans, etc. that others mentioned, but your mileage may vary.

Runs opnsense on proxmox, along with some other containers. It's been a great little box.