Rear Deck Creaking Noise

Neoprene Foam Strip Roll by Dualplex, 2" Wide x 10' Long x 1/8" Thick, Weather Seal High Density Stripping Non Adhesive – Weather Strip Roll Insulation Foam Strips - 10 Feet Long https://a.co/d/i3w8la0
Where exactly do I put the foam? Between the shelf and the window or between the two rear parcel sections?
 
I called for service and the mobile service was out within 48 hours and took care of the problem in less than 10 minutes. No issues since. They know exactly where to place the foam. I believe they used 3 small pieces on my car.
 
Mine didn’t creak but it did rattle something fierce with low frequencies playing out of the rear center speaker, I initially thought a speaker was blown but realized it was the deck lid, so they did the foam fix and resecured the rear center speaker and it’s been perfect since.
 
Where exactly do I put the foam? Between the shelf and the window or between the two rear parcel sections?
Between the shelf and the glass
 
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