Really good idea how are you keeping it in position
As you can see the rear is higher than the front, so it tucks under the upper lip of the boot, and is wedged in position,she believe it or not is solid in position.
That looks like something from a Bond movie,and mine from Gardens world LOL
I worked on fact, easy to put spanner sets and polish bottles etc,that always roll around in boot bottom no matter what you do,and take up needless limited boot space.