The file 'Tablet Wall Mount On Angle 3D Printer Model' is (stl) file type, size is 7.6KB.
Yes, there are a lot of tablet mounts on Thingiverse
No, of course the mount I needed did not exist yet (of I couldn't find it),
Load STL file into Cura (or your fave other program) and mirror one.
If you're smart you screw them on the wall just tight enough that the tablet got squeezed a little, then the angle is variable.
Tablet_wall_mount_on_angle_v1.stl | 33.9KB |