In the last year, I booked 2 rooms at LAX Hyatt, BOS Hyatt, and Hyatt Waikiki. I booked separate reservations, both under my name. In all cases, both rooms received lounge access, breakfast benefits, and upgrade (to better view rooms, not suites). I received spend points for both rooms, but nights credits for just one room. That was for 5 people! In the case of the Hyatt BOS and the Hyatt Waikiki, I even offered to use club upgrade certificates to upgrade the second room, but they said no, it isn't necessary.

This is why I love Hyatt!!

It's also why I will avoid booking Marriott like the plague, despite having lifetime Platinum status. They have always been ridiculous cheapskates, e.g. making me pay extra for a 12-yo child to get into the lounge because they were the 3rd person in the room (that was as an Ambassador, too).