I use one with 6 LAN ports and a fanless 10th gen i5 running OPNsense, and it has worked well for years. It runs many services including Unbound DNS and Suricata with capacity to spare. It’s much better than any consumer router, though I run WiFi separately with an Asus AI Mesh set to AP mode.
The only concerns are that you don’t get BIOS updates, and you don’t know for sure that there’s nothing nasty in the firmware. But then you don’t really know that on consumer routers either.