"so consider the dimensions carefully lest you get something so big it can't be pitched anywhere."
Yes good point.
The Hogback (51 sq feet ) takes a bit less space than the Shangri La3 (59sq feet) , the SL5 takes up 90sq feet
(in case you are wondering, all of the floor space inside the Hogback is usable right up to the side walls)

The blue mat is 6' long, the Hogback floor is square.
franco@tarptent