You can use on any computer really (with network connections of course).
I use on a minisforum PC with 2 NICs attached to it. For this solution is usually needed APs (which tends to be better in general, just more expensive).
There are people that even use opnsense with proxmox (which is a VERY advanced use case) to have the machine for more things.
One interesting detail: with opnsense you can actually have on the same machine adguard for DNS installed as a service for opnsense (and use opnsense to actually force all DNS to to there, as long is not doh, but that is a bit of a different story).
You can use on any computer really (with network connections of course).
I use on a minisforum PC with 2 NICs attached to it. For this solution is usually needed APs (which tends to be better in general, just more expensive). There are people that even use opnsense with proxmox (which is a VERY advanced use case) to have the machine for more things.
One interesting detail: with opnsense you can actually have on the same machine adguard for DNS installed as a service for opnsense (and use opnsense to actually force all DNS to to there, as long is not doh, but that is a bit of a different story).