Centred hitting
Best for a symmetrical projected image and mixed left/right-handed use, but it demands enough width on both sides.
Width determines whether you can swing freely, centre the image, accommodate both handednesses and keep the golfer away from walls.
Stand in the intended hitting position and make controlled practice swings with the longest club while another person checks wall, ceiling and enclosure clearance. A nominal room width is not a safety guarantee.
Best for a symmetrical projected image and mixed left/right-handed use, but it demands enough width on both sides.
Can make a narrower room practical for one dominant handedness, but projector geometry and screen alignment need planning.
If both left- and right-handed golfers will use the room, a wider room or overhead monitor can remove repeated equipment movement.
Practical buying decision
Measure between the nearest fixed obstructions at club height. Walls, shelves, radiators, enclosure legs and stored equipment can make a nominally wide room uncomfortable.
This can work for an offset, single-handed setup after a careful physical swing test. It is not a universal safe minimum.
This gives many golfers more comfortable clearance and a better chance of aligning the hitting position with the screen, subject to player height and swing shape.
More width makes mixed-handed use and central hitting easier, but it does not compensate for a low ceiling or insufficient depth.
Mark the hitting position and enclosure edges on the floor. Have every intended user make slow, then normal swings with the longest club while another person observes clearance.