The maximum booking size on Staze.com is 9 guests. This is because bookings of more than 9 guests are considered to be group bookings by hotels, so you cannot book them via the Staze platform. Email info@staze.com with your booking requirements and the group bookings team will be happy to help facilitate your booking.
Alternatively, you can place multiple bookings for the group with each booking having a maximum of 9 guests.