The Paperwhite is very light weight but very hard to hold. These grab bars solve the problem.
I liked these 2 designs, but they didn't work for me. They inspired me to create a new model.
https://www.printables.com/model/63495-kindle-grip-10th-gen-v1
https://www.printables.com/model/109906-amazon-kindle-grip
My design slips on and off the Paperwhite without a problem. It allows you to hold it above you with one hand when you are lying down. Also include is the OpenSCAD source file, so that you can create your own variations.
The author marked this model as their own original creation.