I'm not a ZEN genius so go gentle with me

We had our old Zen Zone, two Zen Server and have now created two more ZEN Servers and have migrated all of our PC's out of our original Zone and now those two ZEN Servers in the old zone have no connected devices.

Do we have to do something complicated to remove them from eDirectory, or can i literally shutdown the two ZEN Appliances associated with the old zone and that's it.

If nothing bad happens in a week or two then just delete their VM's

Is it that simple?

both the old zone and the new zone are on ZCM 2017