Handy beasts. very effective within their limits.
Got the LiDL version way back first time they had them. Probably been 4 or more opportunities since!
They do like fairly smooth floors. My workshop is fine as I used the waterproof version of standard chipboard underflooring sheets. Usual concrete / garage floor may be bit too rough.
Need to think about where and how you push as the load isn't positively restrained on the wheels. Just rubbery grip pad. So if a wheel set hits something and stops its not that hard to shove a corner off. How did I find out?
Idea of many small disk rollers can effectively be scaled up. I have a similarly low profile variant with 4 square inches or so of rollers on each end of a pair of steel tube sticks to pull my Smart & Brown 1024 away from the wall on its annual backside inspection. About 1 1/2 tons there. Steel tube sticks are 1" square tack welded together.
Clive.