Sometimes, you want the camera to point further down (or up) than the default mount allows for. My solution for this is to build these simple, fixed wedges from foam and ultra-thin plywood.
This one holds the camera at about 25 degrees from horizontal:
Here’s how it was made. I started with three pieces of scrap 1/4″ foamboard and glued them together into a 3-layer ‘sandwich.’
When the glue is set, I use a razor knife to cut the foam roughly into shape.
After refining the shape with a sanding block, I glued a rectangle of 1mm plywood to both sides.
When that glue cured, I sanded off any excess foam.
A half strip of my favorite Velcro-type material goes on the top and the bottom.
When it was all done, I used a black marker to color the whole thing black.