It's not super tight, so you might want to scale it down a tiny bit.
Two screws should be sufficient to hold the tablet, pick holes as needed :)
OpenSCAD file included if you want to adjust hole sizes etc.
amazon_firehd8_7gen_wallmount.scad | 1.6KB | |
amazon_firehd8_7gen_wallmount.stl | 186.2KB |