I am going to be installing backsplashes (I think they are called back splashes -the 4" strip from the counter top up the wall) on our new kitchen countertops. I was planning on gluing them to the wall and then caulking where they meet. My question is this, does the backsplash set on the counter or about 1/8" up to leave room for caulking? I've seen it done both ways but which is the right way?