The Spontan is made of metal (with an enamel coating). While it is designed for magazines and newspapers, it is quite strong, and can hold a laptop fairly easily. One of the problems though is that the metal surfaces may scratch the body of our precious laptops. We needed a padding solution.
For the “inside” of the rack, the part that you can’t see, we cut pieces of high density foam to size. It has self adhesive on one side. We stuck it on the “inside” surfaces of the rack. This must extend down to where the bottom edge of the laptop will rest.