[redbird68]

I am happy with where i placed my 2 post. My garage is 2 cars deep, and I can park a second car behind the one on the lift.
Measured from the wall in front of the lift, the posts are 10' from center of post to face of wall. This gives plenty of work space in front of car, there are no shelves or benches on the front wall though, you might have to factor that in.
From the side it is 4'-3" from center of post to face of wall. As you can see I have a skinny parts shelf on this wall and still plenty of walk around room.
You will love the lift!
Not sure if your garage is designed/built yet, but I also designed my ceiling height to accommodate the lift, and located a 110v outlet for power.
I also went with 8" concrete at post locations, with 1/2" rebar 12" on center in the hole.