I have a 200 amp double throw but I would be coming out of a meter combo instead of a straight meter pan. I had an electrician come and look but I believe it is illegal to modify the meter combo to put in a TS (transfer switch).
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I am in rural central Louisiana so we are out of power a few times a year.
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Even if it was legal to modify this meter combo, I don’t think there is physically enough room to interrupt the feed between the meter and the 200 main disconnect in the above pic. My 200 amp panel inside is fed by the two big black wires at the bottom.
I guess if I won the lottery I could have it required, meter, double throw, then small panel for these few breakers that had to go outside (inside panel was full).