I'm not an attorney, just a practicing solo physician. I can't really answer the legal question you raise. Do I understand correctly you are all sharing space but each has their own practice under a shared roof? If so you are each acting as separate offices. Your billing is already separate, and I think different practices should have separate EMR's.
AC support would probably have to address the matter of separating the accounts, and would definitely be a good resource on the licensing question.
