If all persons are linked to a vhotel reservations in your MDE, and all the tickets are likewise linked in your MDE account, then I expect you would be able to get FP+ for all at the 60-day mark.
we have separate reservations made for our two rooms but it's all under my MDE. So that is why i am not sure b/c of the separate reservations. I do know that when i did the dinner ADRs all of us popped up when making the ressie, so i have to think that's a good sign.