Since I also have a VW Tiguan go, I have given the review of the reviewers "Alex" from 15:03. meant not being able to do a lot wrong here despite the negative reviews also. And I was right.
As described by "Alex", the bag fits very well into the recess on the dashboard and stops there without further assurance through the accompanying hook (the bag is her quasi clamped on the length in the recess -. See photo). My TomTom can be attached without problems on the smooth surface of beanbags and catches himself not to wiggle or slip on uneven roads.
Conclusion: For my vehicle a successful alternative to conventional window assembly. I am very happy with the product.