Mikrotik makes a few that are rack ready. Not sure about rack size. They are extremely customizable and pretty cheap in the grand scheme. I absolutely love mine. some things I am using it for:

• natively supports Wireguard, allowing me to keep everything private and just wireguard into my home network
• I have set up firewall rules that force all DNS through my pihole, including those pesky LG/google devices that try to bring their own hardcoded DNS servers.
• I have backed up my config to a script and literally trashed a switch a few weeks ago, bought a replacement and was up and running with the same config in <30 minutes of setup.

My one qualm with them, is their warranty service is pretty jank. The devices themselves are generally very good, but having had one die on me after 3 years, I was a little dejected I couldn't really get it replaced (they do still offer support though). If you need a specific recommendation the RB5009 is really solid for homelab stuff. The one saving grace is the routers are pretty cheap if you know what you need...replacing them (compared to a unifi or something else) is easier? if you're ok with that