I bought a tablet holder off of amazon with an extending arm that is bendable.  The holder itself was pretty good, but I wanted to sit laying in bed and have the tablet above me. The holder only claps on the side and the tablet would fall down on my face.

This model I made extends the clips around the side, so that the tablet will sit on the clips keeping it from falling out.  I reduced the size of the clip so hopefully only the bezel of the tablet sits on the model but if it seems like it will scratch it you can use some soft felt.

The clips are pretty tight and slide on from one side, with a stop on the other.

Print it vertically with supports just off of the build plate.