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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.

ODROID H4 Plus, https://www.hardkernel.com/shop/odroid-h4-plus/

I wonder if I could run OpenBSD on this.

Same.

https://wiki.odroid.com/odroid-h4/start <- Looks like a very standard X86/AMD64 setup, with nothing which OpenBSD would have any problem with.

Also the introduction of the H4 model line, straight from the horses mouth https://forum.odroid.com/viewtopic.php?f=168&t=48344 with all the gory details.

It has only 9 (old pcie 3.0) lanes though which is bit limiting. In theory you should be able to use 8 of those lanes and get something like 4x10Gbe, which would be actually really neat, but that requires that the lanes are not squandered for anything else.

Just bought myself an MSI Cubi N for exactly that - 1Gbs ports only though.