Looking for a Hyatt in May with two kids

Hello. I am planning to take my 12 and 16 yo to London in May. I do not have Globalist status but like Hyatt for Chase points transfer and their low points per night. I noticed that if I put 3 people in the room, I have less options for rooms with points. I believe its because most of the rooms are just king size beds. Am I able to request a rollaway bed for my 12 year old? How do I go about making this work for the 3 of us? Thanks!