A lot of people do put foil tape under the flexwatt, but the guys at spyder robotics recommended against doing that when I talked to them about it. The main reason not to do it was that if the flexwatt failed and melted, then the foil tape underneath would cause a short circuit in the AC line immediately. So,I don't put the foil tape under for that reason and also at my house the flexwatt was "buzzing" only when it was over metal, such as the foil tape, and apparently this was due to harmonic resonance, which happens at some locations because of the AC frequency. Just my experience and 2 cents. . . .
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