Ceiling height: the measurement people forget
2.4 to 2.5 m is enough for squats, bench press and rows. If you plan to press overhead while standing, or to do pull-ups through a full range, aim for 2.7 to 3 m.
Why it decides the plan
Floor area can be rearranged; a ceiling cannot. The TOTUM stands 2.4 m tall, so the structure itself fits under a standard ceiling. What changes with height is what you can do above it.
Check the lowest point
Measure to the lowest obstruction, not to the slab: beams, lamps, ducts and fans all count. Measure where the rack will stand, not at the door.
If the ceiling is low
A lower room still works for seated and lying lifts. Say so in the consultation and the layout is drawn around it.