Hi ~ I had a stimulator ~ it's been removed due to problems, but my leads were between my shoulder blades. I'm not sure exactly where. I too am a lumbar patient with pain going into my feet. The stimulator covered the whole area, but it seemed that the stimulation irritated the sciatic nerve more than it helped. I was in more pain than before.
I had to have it removed after 6 months, which is no picnic. I had thought all along the SCS was approved for the back. Goes to show you what i know. LOL. Hugs, Lee