[Paul F]

I have the SP 7X. It's solid. I thought about putting it level with the floor as well. But it has been fine as-is. Flush would be cool.

You will of course, lose some clearance height by putting it in the floor.

Note that it does drift back some as it goes up. So the car will end up going backwards a few inches as you lift it. This may be crucial if you are going to set the lift flush. You won't be able to make adjustments fore/aft if you don't get it right the first time.

The lifts end up being nice tool shelves when working on the car.