A US-friendly link to a similar product is https://amzn.com/dp/B09H6QV53R (I searched "arca-swiss tablet mount 300mm" to find it; there are others that only go to 230mm width for folks interested in this with smaller portable monitors).
Personally I am currently experimenting with a Lenovo ThinkVision M14[0] perched (a little precariously) atop a Roost V3 Laptop Stand[1], which is a lower-quality but lighter, more minimal setup than what you describe.
When I'm on Zoom call, which is often, I can move the laptop onto the stand for a better camera angle and put the external monitor beneath.
I'm not doing graphics work and I find the 60Hz, 1920x1080, usbc-on-both-sides monitor sufficient for my purposes (much, much better than an old asus one which was 30Hz or less, and laggy).
