This is a simple laptop stand I made when I was first learning how to use CAD. It measures 175mm (7")  wide by 159.4mm (6 ¼") tall by 110mm (4 ¼") deep.

 It can comfortably fit up to 3 devices if you choose to use the front lip. I added some 10mm wide (½") adhesive felt out of an abundance of caution to protect the edges of my devices, but PLA shouldn't hurt anything made out of metal.

Pictured is a 14" Macbook Pro sitting behind a Remarkable 2 note tablet, but it remains stable with my 16" Macbook Pro as well. Macbooks work well in clam shell mode since all ports remain accessible even if devices are stacked in front of them.