I agree...the original adhesive on that handle left a lot to be desired...really crappy, actually...
I liked the idea that I was getting an "official smart product" to trick out my rear hatch...but, after all of the effort and the $$$ to track down the Brabus handle (from Canadian parts dealer), I was
mightily disappointed in its lack of effective attachment.
anyway, no problems at all with the new setup, so all is good and I can now report a happy ending...