Hey there William,
Welcome to planDisney and thank you so much for your question! The
Disneyland Hotel is my absolute favorite place to stay when visiting the Happiest Place on Earth - it's such a great way to keep the magic going throughout your trip. I'm happy to hear that you're considering a stay here during your trip later this year!
It sounds like you'll be visiting with a big crew, so I think a 3-bedroom suite is a smart way to go. As you mentioned, there are a few different configurations for these rooms, so if you have a specific preference on which configuration you would prefer then you would want to
call the Hotel Reservations line and speak to a Cast Member.
I called this line as well to confirm, and what a Cast Member shared with me is that they can note your room configuration preference but cannot guarantee it. It will be included in your reservation notes but the actual room that you'll be staying in is determined at the time of check-in so the Cast Member at the hotel will be the one who will work to try and accommodate your request. However, it does depend on the current room availability at the time you check-in.
I hope that helps, William! Thanks again for your question and I hope you have a wonderful time on your visit to the Disneyland Resort.
Have a Magical Day,
Greg