Everywhere you mentioned for sure.Underside of the roof, inside the entire trunk under the package tray, I f I could reach it it was shot. Also the entire underside and up the rear wheel cans. Dean also shot expandable foam insulation in the C pillars and basically every cavity on the body he could reach, including the area in the footwell left and right, where the door hinges are.He made cutouts so the adjustment bolts are accessible.
If you do this be sure to use a lightweight SOFT curing type of spray foam, it is white vs the more yellow type that dries hard. That type will "ripple" on you