I have worn patches for pain before and I have known a mom who had a child on the clonidine patches and we both put them on the backs.
Now my patches were worn for three days so I also used a cover to go over the patch to keep it on because it had a tendency to fall off. If his do to, you could try a large bandaid and if that doesnt work I can give you the name of these covers.
Putting them on his back where he cannot reach them will stop him from pulling them off.