I just got my matte VRS style lip from JL as well and I have no idea how to install it either? It came with some screws but no screw holes. And I agree there should be some type of adhesive barrier between the two lips as well. I seen some guy used black weatherproof cauking.... I am planing on wrapping my lip in gloss black vinyl so I suppose that will give it some cushion.
If you figure it out please PM me and let me know.