@bbrendon I liked the clean look without any ledge. It works but I decided to upgrade to two more magnets in the middle as there is still some unused space left and I want to make it even stronger - just to be completely sure. I modify the printed mount today and upload new pictures and a conclusion later
@shanem I used a galaxy tab t510 before and Lovelace ui was horribly unresponsive on that slow Tablet at the lower end. The second reason to upgrade to an 2019 7th gen iPad (the cheapest) is that browsing is way more comfortable (thus I wanted a magnetic wall mount to use it at any time and easily attach it again to the mount)