I went a slightly different route - I ordered from the US the sound deadening headliner by Design Engineering. It’s basically some engineered foam that is contoured to precisely fit the inside of the roof panels, and sticks in place with adhesive pads.
My primary interest was actually to get some thermal insulation (ie. reduce the amount of radiative heat coming in via the black plastic roof), which the product does, but its main purpose is sound reduction. It’s had a noticeable effect on reducing noise, and I think they also sell products for the floor too.
However…in the end…it’s a Jeep…driving 10-20 kph slower will also achieve the same effect 🫠