Nothing special if you run a "normal" (non-exit) tor relay. Use a device that is powered on 24/7, you can set limits on bandwidth usage if you need to. Other than that you just need to be handy enough to forward ports on your router/firewall and to modify various config files and such.
Discussion
Awesome, thanks for the response. Might run one on a Pi4 and keep separate from my PC. What about running the snowflake extension? Is this not as effective or any limitations?