It looks like from the installer you can actually put the Office 365/Azure AD part separate from the Exchange Online part. Since the Exchange part is still PowerShell, that has to go on Windows and that makes sense. Can the other part be installed on the IdM Engine server (in this case SLES)? Or does it have to go on another server separate from the engine and we it accessed via a remote loader?
Yes, it can be put under the engine on Linux.