Hello, here's a laptop stand, which is made to be fixed under your desk. I advise you to print it out three times and position them so that there's one on each side of your laptop, and one behind it, so that it can't fall off (see image).
I've modeled it with Fusion 360, and I'd advise you to use 4mm-diameter screws to secure it.

I hope you like the model, Maxime :-)