mine attached like that, its been on since 06/07, so it works fine. just have to be careful about how you line it up since with a good tape you almost have to be perfect cause it aint moving.I see. Apparently they are not all the same. I like the way that one mounts.
The Cervini's one has no provision like that, so you are using double stick tape and a couple screws in the corner. I never had the warm and fuzzies about it being as secure