"He who marches out of step hears another drum." ~ Ken Kesey
As you press on it, yes it will give a little as you do in the video. This is OK and it the dial is on zero so you look good. What we tell people, as long as the meter has not been dropped, the calibration will stay in range.If you buy a new-to-you meter, have the seller acquire a calibration receipt or send it in yourself.
the 'feet' (round bars on the edges) can be adjusted to become parallel/make the meter sit flat with a tiny allen wrench.BUT - you may screw up the calibration of the meter trying to adjust them.
Hard to say. I've only seen 3 dropped meters in my time and 1 of them was doa with no movement.. the others set to zero fine but the readings were way off.