I got one of these a couple years ago for reading comic books and it’s been pretty great. My only gripe was having to use Fire Toolkit to get rid of all the Amazon-specific crud.
https://forum.xda-developers.com/t/windows-tool-fire-toolbox...
I keep mine floating over my bed; it's great for comics and pretty good for ebooks. The best upgrade would be a screen with better blacks.
I have a clamp like this: https://www.amazon.com/Gooseneck-Tablet-Mount-Holder-Bed/dp/...