if i was u i would line up the spoiler and make the holes in the bootlid at the top corners so its fixed and then bond it on down the sides mate, it wont go anywere, or you could go for the easy option and bond the whole spoiler on? or when you want to make your next purchase from over here get urself a glanza bootlid and it will have all the fixings u need even tho this would obviously be the more expensive option lol