You can put them on top of the wrap. In my case, the person that did my xpel later put the stickers on some extra xpel trimmed to the exact size, and then put that on top of the xpel already on the car. May sound silly, but made it easier to adjust to get it just right when applying, and he said it'd be easier to remove without damaging the xpel underneath, should the need ever arise. You can't tell it's on a double layer.