Hey Chris, how's it going? So the first thing my friend and I did was remove the middle plastic trim piece near the rear seats under the carpet. We replaced that with a piece of birch and that gave us something for the L-brackets to be screwed down to. The top side of the baffle I believe we just screwed directly into the sheet metal. The baffle was cut to exact measurements so just sliding the baffle in made it solid, the L-brackets (4 on top and bottom) just helped that much more. We couldn't find a place along the sides to also screw the baffle in but it wasn't really needed.