Apple’s DEP allows you to have new Macs (and old) quick added to your MDM. Signing up for the Device Enrolment Program allow you to use Mobile Device Management with your Macs and iOS devices.
You’ll need an email address that is not associated with an Apple ID and you’ll need your DUNS number among other things.
Program requirements are spelled out in the help documents.
You’ll need your DUNS number. Don’t know it? Look it up!
Basic intro to DEP for Business