Sub Frame Connectors after Interior is finished

Well... here is my dilhema.

The interior of my dart is finished, and by finished I mean the floor was painted, sound deadening, jute and carpet all laid. It has been done for a few years while I work on the body.

My dad suggested that since I was prepping the undercarriage for paint, I should install some sub frame connectors. I never gave them much thought because this will be a very mild/daily street car. Anyway after some research I bought the US Car Tool ones that form to the floor.

I took out the carpet but cannot remove the sound deading. I am thinking if I just do a 1" or less beads moving around, I should be ok? I just don't want to melt all that deading.

Thoughts?