You can use GPOs to manage your local administrators: https://www.grouppolicy.biz/2010/01/how-to-use-group-policy-preferences-to-secure-local-administrator-groups/#:~:text=%20%20%201%20Step%201.%20Open%20the,groups%E2%80%9D.%20These%20two%20options%20will%20automatically...%20More%20

 

You end up with a local administrator account per computer, with each account being also domain user account, but you can then script the setting of passwords. Or you could use LAPS depending on why you needed local adminsitrator accounts per machine.

The issue I have is the GPO inability to add an account and set the password these days due to security restrictions imposed by MS. If I could create the account, I could sort it