Even if one puts a heavy object on the upper or middle tray, the surfaces bend ever so slightly. The model of the same company in silver is more expensive by 5 euros in the rest; If you can live with the white, then this article is a real bargain.
It consists of metal sheathed with plastic, the distance between the shelves is approximately 9 or 8cm. Seen from above, the frame is rather trapezoidal, ie not quite square. On the picture you can see quite well the capped or reduced edge.
It can also be used to store other things to save space, therefore I order the item again for my external hard drives :-)