I wouldn't tape the probe end. Also I wouldn't put that huge piece of tape on the heat tape itself. If you are putting the probe between the heat tape and the cage floor, I would just tape one side of the heat tape and the end without the plug, then position the probe and tape the other 2 sides of the heat tape. Your probe shouldn't move. If you are worried, you can put a small piece of tape on the probe wire by the end of the heat tape at the wire connection. But I would personally never put anything between the heat tape and the cage floor except the probe.