Interesting. I don’t think I’ve seen of one of those. I tried a sort of leaning forward thing that was supposed to help my back. It was awful - well you can tell, they started appearing on eBay (used) then in car boot sales, descending to charity shops within a couple of years. I ended up standing with the (then) laptop on a crate. A standing desk sounds like a good idea - a bit like the bar in a pub.