Might be worth noting. I have two different Tonneau covers.
One has the Velcro strip around the boot edge, but nothing on the inside of the car edge (no Velcro and no poppers). When fitted this tends to allow wind to get up under the Tonneau cover on the inside of the car edge, so I intend to fit female poppers on that edge myself (if I can find suitable that mate with the male studs).
The other has no Velcro strip, but has poppers on the boot edge and the inside of the car edge.
If you follow Alex’s note above, you’d end up with best of both worlds – Velcro around the boot edge and poppers on the inside of the car.