Summary

If you use a heavy screen you know it's not easy to hold all this.
Mine is a 3D Robotics 7" display.
Print this "crochet" and screw it on a 350x200mm wood plank.
Put 2 straps (from an old bag, for example), and that's all ! Even my cat loves it.
To print the part you will need support, and high infill to make it strong.
I made this for my Cheerson CX-20, but it may be compatible with other remote controllers, you can tell it in comments.