Please don't flame me on this cuz in a sense it is tech. Move if you must, to where I don't know.
Has anyone install one of these in their car? Perhaps had their bottle of spray painted to match?
If you have one, how does it sound? If you have a vert, even better!!
Just buy a bracket and screw it into the floor of the trunk. Then just mount the bottle onto the bracket. You can even put a fake bottle heater on it...