This stand meets my needs: it has a 15-degree angle and supports three eReaders — one PocketBook InkPad Color 3 (7.8" without cover), one Kindle Paperwhite without cover, and my wife's Kindle Paperwhite with cover.
The Fusion file is available for any changes you may want to make.
PB__2x_Kindle_stand_v7.f3d | 273.8KB | |
PB__2x_Kindle_stand_v7.stl | 1.0MB |