Seeking wisdom from those who have installed a lift

I've had both 2 and 4 post, I've found the 4 post has such a large footprint, and your always stepping over, or ducking under something, especially in a small shop.
The 2 post has a relative small print, the supports on either side extends the load. The arms swing out and "park" nicely alongside the extensions.
I had those welded to the lift as per their instruction if you had 4" concrete, but weren't sure of it's mix, I had It at a previous site, then moved it here, pad poured to spec .
Here's a pic of the support extensions I mentioned in a previous post