Planning for FIM upgrade to MIM, might also use PAM

Good day,

We are still using FIM 2010 R2 (synchronizing between our HR system and AD).  I would like upgrade to MIM 2016.

I am not yet planning to use the PAM functionality of MIM, but I want to make sure that the design that I use won't later exclude PAM.

The short version of my question is:

Is it best practice to use a completely separate instance of MIM for PAM? The answer seems a common sense yes, but there is nothing explicit nor implicit.