Do you mean the round booths pictured below? If so, six would be a tight squeeze. At best 4 people (with 2 of those kids). We had one of them once and it was the most uncomfortable seating ever. They look cool though. Of course that was our experience. I am sure many love them.
As far as getting one....you can request one through your
travel agent or Disney directly depending on how you booked. Never guaranteed.
View attachment 472964
MJ