Sound deadening Fat Mat with jute

[88Stanger]

I am doing a full frame off resto on my 69 and now I am looking at what to do for the floor in the cab. I want to install Fat Mat over the floor, back wall where the gas tank was and the fire wall. Here is my question, do I still install the firewall 3 mats on top of the fat mat? I tried a search and after reading thru a bunch of pages, I could not find the answer to this question.

Thanks for comments.