1. You ask about all locations with the same name. So sometimes you will move some personas into / out off some locations, not to get extra cards, but to make a question more tricky.
2. No, deck has 4 separate locations, but you are righ - they all have the same name. There can be 3 personas in each of them (so 12 totally at the sundeck).
Thx for the clear explanation ! Looking forward to play it again.