Blimey - you wouldn’t catch me going under those the height/base ratio is completely wrong and a flat plate on the bottom assumes the floor/surface is perfectly flat/level - if outside, a gust of wind will push the car over. If inside, a tug on a seized bolt will pull it on top of you. Forget to put the handbrake on and…
I do have a pair of the below bought a decade ago from CJ Autos but use only on two wheels at a time - pricey and heavy but good quality. Drilled some additional holes with pins as a safety stops as it rely on the threads not stripping to stay up. Lifts my Shogun no problem, will take wide wheels and locates the tyre safely.
It must take a very skilled driver to get them up there from those little launching ramps.
I get the wife to blow in a brown paper bag then creep up and smash it between her palms. (was going to write something else then )