Are there multiple rooms for multiple groups, that can go in at once?

A total of 4 rooms wirh a max of 6 people per room

Yes. They have 4 separate rooms.

I beleive they have 4 rooms and every room is different story, maybe you are lucky and can booking more than one at the same time, good luck with that.

Yes, Assuming you can get all the same appointment times. Great for groups.