If you undo the 2 nuts holding it on, the threads will disappear and you'll hear a clang as a ~12x1" metal bar with 2 screw threads drops onto your exhaust

removing the wheel and wheelarch liner
stripping the insulation from 2 foot of thin gauge stranded wires
separating the wire threads
anchoring the strands to spanners
feeding the strands down through the holes in the boot
tieing the strands around the bar and wrapping them around the threads
pulling the wire up from the boot, carefully manoeuvring it up the tiny gap at the side of the bumper
trying for 20 mins to get the bar's threads through the holes in the boot
then getting the nuts back on
before wondering how to get the mount between the nuts and the holes, giving up and stuffing a glove behind the amp to stop it wobbling around
Nightmare.
DON'T REMOVE THE BRACKET!!!!