UPDATE: Okay, so it turns out this may not be such a great way. I thought the plugs I was using were aluminum, but I tried a magnet with them and they were magnetic, so not aluminum. Actually, I don't know what they are. My concern is that they may be zinc coated which isn't safe for cooking. Maybe not a big risk used like this but I don't want to take the chance. Just thought I should pass this info on.
Looks like I'm going back to high heat tape.
DAMN!!!