This subject has been talked about plenty. Do a serch and you will find several threads related to this.
IMO its best to use two layers to maximize heat and sound rejection.
Start out with the Dynomat Extreame (or one of its competitors) then top it off with something like Fat Mat (3/4 inch thick) foam insulation.
It did wonders for my Axis. Apply under the dog house and either under your carpet inside and or under the floor boards / on the fire wall.
But it might be hard to use the 3/4 inch thick one under your carpets so I would double up with the dynomat stuff.
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.