I think Trump could sign an executive order that The White House is a designated Federal Penitentiary if he is found guilty on Federal charges. Then it would need to be staffed with corrections officers, and he’d have to apply for day leave to leave TWH. (On state charges, he could just abscond from New York and refuse to return).
He wouldn’t be able to get visas for overseas destinations, so people from other countries would need to visit him.
Of course, if elected he would just pardon himself. None of his supporters should expect pardons though.
