I'm sorry for repeating a question that I'm sure has been asked numerous times but I havn't been able to find out quite what I'm looking for. I have a 41 quart quart melamine rack I need to put heating in. It is a horizontal rack and I'm going to individually wire flexwatt ran to a thermistat. My question is a 1ft of 11" flexwatt sufficient per shelf per one side of a tub? Or is it over kill.