Owing to the shape of the fibre enclosures, it was necessary to anchor them. Otherwise, the vibration swirls them around in the trunk.
The enclosures are anchored to the sidewalls of the trunk with velcro strips.
I could not fix them permanently, as reaching for the spare wheel would be impossible.
The wiring of the subs has been done with grips. In case, more space is required in the trunk, then both of the subs can be easily removed in two minutes.