I don't even add labels. haha I keep saying I am going to do it, but just haven't gotten started. You have an excellent space up in the center blocks, if you want to add a large one. Most people don't want one there because it will get quilted on.
Most folks add a label after quilting has been done. They put it down in one corner so that the binding catches it on two sides and they hand sew the other two sides down. Some people even put extra fabric behind the label, just in case repairs are ever needed.
Edited to add: I would consider adding a sleeve so that this could be hung on a focus wall. I will bet that they will want to look at it for a while before or if they ever use it.