At the house I have a 3 car Garage with the center door having a 4 post lift. (4 car cars in the garage) 9 foot wide doors 7.5 foot tall. I ordered the lift extra high to be able to walk under it with ease and extra wide so as to not have to nogiociate the posts with the every day driver. 7000 # lift 220v hydrolic pump. need minimum 11 foot head clearance, I have 14 foot and have a celing fan so it all works. One other thing that may be helpful. I placed the lift as close to the overhead door allowing as much space in front of the lift to work on the car and to move around. Yes it is bolted to floor!!

Garage a bit messy, but you can see the idea.
plan well and you wil be happy,
good luck