Putting foil tape UNDER the heat tape?

Yeah the thing is though I am researching and I see all these posts about people having buzzing sounds from their flexwatt when using proportional thermostats (while other people do the same and do not) and warnings of what would happen if the flexwatt plastic covering melted and the foil created a short etc. Granted a lot of people have no problems just like some drunk drivers never got into an accident, but doesn't mean its a good idea, right? To tape something that is electrical with an electrically conducting tape, it seems to me there should be a better reason than that it's really sticky and durable.

Someone recommended "contact paper" on a leopard gecko forum, but someone also responded with that the heat tape kept the adhesive warm and sometimes it slides. Anyone tried this?