I’m putting down deadener in the car and curious about where exactly you guys are putting it on/in the doors? Right behind the door card or?

 

I use dynamat on the inside panel of the door skin. It helps give the door a nice solid sound when you shut it. It's easier to install if you cut it in half so you're not wrestling with the whole sheet (I cut it the long way). You could quarter it to make it even easier. Keep in mind that per the manufacturer you only need to cover 80% of the surface to make it effective. Be careful to leave any body trim holes open.