In these times, seeing your family and friends can be quite complicated. So I wanted to make video calls a little easier. With this design your device is a little elevated and not too much angled (80°) for video calls like Facetime or Skype. It is big enough to support your tablet in vertical orientation. Then the gap even allows a cable to be attached to it, so you can charge the battery while making a call. There are two holes for the bottom speaker and the microphone of your phone to reflect sound in your direction. They are designed to fit for an iPhone X/XS but should be big enough to work with other devices as well.
For slicing I used the experimental feature of Cura "make overhangs printable". I didn't want to adjust the design manually and I wanted to try this feature anyway. With a little extra support blocker it worked quite good!
The angle to the surface is 80° and the thickness of your device should be (with case) under 11mm so that it fits behind the brackets.

Update (19-04-2020): I changed the design a little bit in version 2. I added a small bevel on the bottom of the part and holes for Ø 8 mm rubber feet. I know these will be closed of the "make overhangs printable" feature but they are not really necessary at all.