Best way of adding computers to Entra.

I'm in the trial period with 365 Business Premium and looking for info on how you add computers to Entra using cloud logins. We are a business that has over 100 computers and 90% of them are shared by multiple users during any given week. The training guides and such I've seen of adding devices to Entra seem to be focused on 1 to 1 computing, so basically you have user A's computer and you use user A's cloud login to add the computer to Entra. This seems alien to what I'm used to with on prem AD where you use a domain admin account to add all your computers to AD. Is there a reason you wouldn't use your Entra admin account to add all your computers to Entra?

Thanks,

Andy