Rattle trap removal or not in Dart interior

The car I have now is going thru an interior re-furnish. It has Rattle trap on the floors. I did not know it was there until we removed the carpet. The bench seat is going bye bye and I was getting the car ready to install sub frame connectors. I’m concerned the rattle trap is going to be an ordeal to remove and I don’t want it to catch fire or be in the way of welding in the bucket seat reinforcement tabs or the sub frame connectors

any thoughts or ideas before I dive in much further!