We have a few Surface Hubs in our organization which I'd like to add to intune. Obviously these devices should not be associated with a specific user, so I started looking into the Device Enrollment Manager (DEM) feature as a way to join the devices w/o tying them to a user.
as far as I understand the documentation you could enroll your Surface Hubs with an device account and this account needs an Skype 4 Business license basically. In future this might be changing because of Teams but for now it's S4B. If you use more than S4B you might add some lics like Intune, AAD, etc.