Adding shore power – How many breakers?

I’m in the process of adding shore power to my boat, which has no AC at all. I recently sold a Bene First 36.7 that was equipped with a shore power connector, which then went to a main breaker that was 6 feet from the inlet and still under the cockpit, then to the main panel that had another main breaker and several circuits. There was no galvanic isolator. My plan for the new boat is a Smart Plug inlet with a galvanic isolator, then a main breaker close to the inlet, then to a main panel…Adding shore power – How many breakers?