I put mine on the lower left. I've tried printing my own on white fabric with permanent markers and I made some on my computer by ironing freezer paper to the fabric so it will go into my printer.
One question: do you always label your quilts? Sometimes, I feel a little silly, like will anyone really care who made it, and would it even last long enough for anyone to see it? I stll do label them, however. (Those "quilt police" may come after me if I don't. lol)