My MacBook 13.3 stands perfectly still on the stand, because the 2 supporting feet are much wider than the thickness of the MacBook. If yours slides, either the product has changed since I bought it, or you are placing the stand upside down.
Hello,
I bought the product a long time ago and am very satisfied with it.
In the steepest position, it is approx. 20 cm high and the laptop is then at an angle of approx. 70°. In the flattest position, the height is approx. 6.5 cm and the angle is approx. 30°.
Hope the answer helps. Greetings