Payment - unfortunately - will stay to have to be in advance, however, luckily it's roughly a month after the end of registrations.
So if you can get and send the money until the end of February/beginning of March, it should be all okay.
As for your question, there most likely will be 2 persons per room, but if you
really want to have more people in it, I might be able to get 6-bed rooms for you. I'd prefer not to have that organizational work added - but you know what we TOs do to make our attendees comfy.