The best way to attach to the pipe

The manufacturer recommends tape with a minimum temperature rating of +176 F, this is a good electrical tape. This type tape is to be run along the base of the pipe area to be heated and can be run back on the top side if needed. Likewise one needs to wrap the pipe with insulation to be effective. EasyHeat also makes other tapes that are wired to a sensor unit and cut to length that are to be wrapped around the pipe and can be overlapped.