I use a 42" 4K TV as a monitor and I don't have a good spot on my desk for my work laptop. I made this bracket that uses 2 VESA screws to attach to the back of my TV. So it acts as a shelf for my Dell laptop and the power button just peeks out over the top. The screw holes are 200mm apart.

Printed using PETG, .4mm nozzle and 100% infill just to help keep it from breaking. It's lasted months and hasn't sagged at all. I put circles in the back wall just to reduce on filament and also give some room to run cables through or even attach a string to if you are worried about the laptop sliding around.