Yes you can. And floating around in the box is a little sticker that says "MAIN". You do what you said and put that little sticker next to it. Works fine, it just takes up some of your breaker space.Can’t you put in a double slot breaker like you would use for air conditioning or an oven and feed the panel through that breaker from the side? It looks like another breaker in the panel, but it’s actually the disconnect for the panel. Yes/no?
 
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