FSLogix setup question

Currently we are running Windows Server 2016 RDS with User Profile Disk. We are looking at installing FSLogix so we can do cached Outlook mode with indexing and OneDrive.

If we install FSLogix Office 365 User Profile Containers what happens to the current User Profile Disk? Do we just point the containers to where they are located and it works without issue? Or does it create a new User Disk for the users?

Thank you