We recently had a major failure on our CM from a patch and had to promote our backup CM as primary. Our backup CM was in a different geographic region which doesn't work well with CM/MC vulnerability scanning. We were going to move the virtual backup CM to the same location as the MCs but we would have had to change the IP. That would have required us to remove the MCs and re-add them to the new IP and we would have lost all of our audit process jobs and some settings. Please allow a client to add FQDN as well as IP when setting up managed environments.