sound/heat insulation - rear floor in convertible

I used Peel and Seal from HDepot/Lowes roofing dept https://www.lowes.com/pd/Peel-Seal-...MI84Tkxr_b3QIVkMDACh0mfQ6qEAQYASABEgI-tfD_BwE for the whole floor on my 69 Dart vert as cost effective option ($15 roll HDepot). I also got the mass-backing on my carpet Link: Everything You Need to Know About Mass Backing and have had no problems living in hot/sunny South Fla. Had considered this as well: Aluminized Heat and Sound Insulation Shield, 4 x 6 Foot Sheets | eBay