Good luck if you don’t have a dream machine and you aren’t using 192.168.0.0/16. If the APs don’t find a dream machine they won’t get an IP from DHCP for some godforsaken reason and revert to 192.168.1.20 and won’t do anything until you configure them with ssh. Except you have to ssh on a lan that doesn’t exist which is a huge pita. This is why I have omada APs now.