sound/heat insulation - rear floor in convertible

I hear you. Frustrating in a way 'cus a lot of the products out there are for protection from radiant heat where for example you want to wrap something in a heat shied to protect if from some nearby source of heat that radiates heat at what you are protecting. That seems different to me from putting the product right on the heat souce (in this case the hot metal floor). Seems the floor would transfer the heat right to the material you put on it.