I remember we had that car holder thread, but did we have something about bike holders yet?
Surprisingly, my first attempt at trying something out (now that I bought a new bicycle after not having cycled 15 years or so) was a winner. Of course, the sliding mechanism is locked, but I couldn't imagine typing something while sitting on a bicycle anyway...
The exact item seems to be available through Amazon's European sites with the same ASIN (B09QX474PY). here's the UK link (where it isn't in stock, though): https://www.amazon.co.uk/gp/product/B09QX474PY/
The relatively thick Pro1