As others have said, the adhesive is no good, but the product itself is the best I have ever used. Fix the problem with the adhesive and I believe your product will get nothing but 100% good reviews. Personally, I just lay them flat, but I have no children in my house so I can do this safely.
I am having a problem finding this product now.
I have also used the Combat Roach Killer (in the syringe) and it is the best I have ever used also.