It is better to have a good flat jaw pliers to adjust the angle of the tray guide plates which bear against the walls, otherwise you have to have to tolerate an unsightly shelf that the front edge is raised to the point that bottles posed above does not hold water. Ah! .... That the products are not likely to fall because they are packed shivering in the corner of the walls, but here is a little exaggerated. I do not mind an installation in a corner of walls is always tricky but Wenko could review what is happening in its design offices and ask the engineers to try to put their own shelves