Domicile is one thing; "residency" for the purpose of a professional license is something else. Your domicile can be pretty much whatever you say it is becasue intent is as important as documentation. A license, on the other hand, is governed by the rules/laws of the state or city issuing the license and you have to conform to their requirements.
You can readily establish your intent to be domiciled in a state by obtaining a driving license there, registering vehicles, even opening bank accounts. All are indications that you consider the state to be "home". But if you have similar connections in other states, then the two may be weighed against each other.
Residency, on the other hand, is established under the terms of individual laws that rely on residency as a criteria. For example, you might be considered a resident for tax purposes, but not for some other legal purpose. So you are going to have to come up with addreses or other evidence that is acceptable to the real estate and nursing licensing boards. Only they can answer your question as to what is ok.
By the way, if you have a Florida driving license, what address will you use there? Odds are it will be acceptable for other licenses as well.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL