I used a similar mount to the ones pictured above, except with rubber straps that wrap fully around the extinguisher. I also used a larger 8.3 lb extinguisher. It does not interfere with the fold and tumble, and if placed correctly, does not interfere with the slider adjustment either. The rubber straps form a positive engagement, so I'm not worried about the bottle coming loose in a high energy collision.
Once I finally get around to printing a larger 3D printer, I may try and print a newer low profile mount out of polycarbonate to see if I can save even more space.