To solve the major problem, which is the cover 'jumping' and making noise when you drive over anything rough, I simply used velcro. Velcro has two parts, the 'hook' part and the 'loop' part. I got some peel-and-stick adhesive velcro and took care of it in two steps:
- Cut a 2" (5cm) square of the 'loop' velcro about and apply it in the correct position on the hatch.
- Cut another same-size square of the 'loop' velcro and of the 'hook' velcro, and stick the adhesive sides together back-to-back forming a pad with the 'hook' on one side and the 'loop' on the other. Stick this new pad onto the velcro square on the hatch, to make it thick enough to press against the cargo cover and hold it tightly in place.