Usually the rabbi gets a special seat. I'd seen the Pnei Yehoshua's contract in Berlin 200+ years ago specify a special seat for his wife as well, but is anyone aware of shuls today that do that?
Most of the Shuls I have been to (Chasidish) designate a special seat for the Rebetzin.
In Boston, the seat were the Bostoner Rebbitzin sat before she past away is not used by anyone. I think there is a sign telling people not to sit there.