Thanks for the replies...looks like the Molly's are the way to go......no comments back on using construction glue.....
Couldn't really describe what I wanted to do so tried my hand with "SketchUp" to illustrate the task. Our pantry have these shelves (actually 3 ea) with no way to keep things from falling off during travel...at the time we were rushed and using Command Hooks....placed a few on the walls and under the shelves and then stretched a cargo net over all the shelving...got it at HF for $25...worked really well but when applying pressure, the hooks started popping off....we therefore want to attach a sturdier hook(s) which is why i need to attach the boards.
I realize there are other ways to secure the shelf items but we really liked the net...with the amount of elasticity you can actually pull items thru the net if needed without taking the net down plus it doesn't take up hardly any storage space.