Article II and Amendment XII both say:”The Electors shall meet in their respective states and vote by ballot for President and Vice-President, one of whom, at least, shall not be an inhabitant of the same state with themselves”.
That's confusing!
"...one of whom..." Does that mean "exactly (or "at least?") one member of the set consisting solely of the P. and V.P. not being an inhabitant of the same state as the other member of that set?"
That could have been expressed much more elegantly: "...and vote by ballot for P. and V.P.; the P. shall not be an inhabitant of the same state as the V.P."
Regards,