It is always a good idea to keep enough room on the backside to walk behind the rack. I don't know the TL setup good enough to know if the machines rear handles extend far out behind the carriage. But you will need to account for that. You also need to get behind the machine to pin the quilt backing to your take up roller and leave room for doing pantos should you ever decide to do one. So at a bare minimum I would leave 2 ft back there if not a bit more. You also want room to walk around your rack at least on one side. My set up is in a small bedroom approximately 11 x 14 and I have a 10ft rack with a 26" machine head. I have about 3 ft floor space behind the rack and that is a snug fit. I have approximatly 4 ft in front as the bulk of my work is done in front and I have about 3 ft on one side to walk around. The other side there is a radiator so I could not move the rack all the way to the far wall.