Due to the fact, that space is very rare in the Tesla roadster, the team is always looking for ways to maximize the available space for the trunk and cabin.
One possibility is shown here:
First aid package fixed with a hook-and-loop fastener at the side of the electronics module just above the left rear wheel. The rear deck is covering the first aid package completely. Instead this stuff would had to find its place somewhere in the trunk or the cabin.
So the team got some extra space for electronics 😎