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I've often wondered. I guess it's common sense and it depends on the design on the refractor as well. You need to transfer the heat to the glass so the dew strap should be as close as possible and in contact with the cell or something that's linked to the cell. Most retractable dewshields have a small gap between the main tube and the shield so putting a strap on the dewshield directly won't do much IMHO. You're best putting the strap right after it on the tube? Again it depends how far the dewshield slides out and how close to the lens cell it comes at the back. If it's an alu tube good, CF tube well...
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