Multiple stand alone servers using one radius server?

Hello, I have a question.

I'm working for a company and our problem is we need a username and password for every server.
We would like to set up a Radius server using an extension so it can use a SQL database for the users.

Is it possible to put 1 username and 1 password for each user in this database so we don't need more then one for each server?

Also can we set up policy's for those users so they can't access every stand-alone server.

Kind Regards,

Michael