Reply to engatwork
We bought the low rise lift in the first place so that we could drop the engine and trans as a unit from our (mid-engined) Porsche 914s, and it works extremely well for that.
Dropping a trans from a front engine RWD car is never easy due to the weight, but I'd think that task would be easier with a full height, both sides lift (my hydraulic piston down the middle might get in the way, depending upon where the trans is front-to-rear).
Back to the garage floor for a minute, most are 4" of unreinforced concrete and the best are 6" of reinforced concrete. I'd trust the latter with a four post lift, but neither with a two post lift.