Questions about Kuli-Muli Bath tub grate simple

How high is the bracket on the outside where it rests on the bath? I only have a gap of around 1.7 cm, as the tray is integrated into the wall.

12kg load? That's far too little...

This product is suitable for bathtubs of which dimensions (inside width of the bathtub)?

Can a standard baby bathtub placed on top of this item? Which maximal weight can it support?