It took a bit of fiddling and shimming to get this thing squared up. The box was slightly out of square and I only have 3 studs to secure it to; in the left rear corner, midway on the back wall and about 14" off the corner on the right. It's square to the back wall, but slightly out on the left. However, my filler scribed nice and tight to the wall so I won't need any scribe molding there.