I've bought this cable rail for the bathroom, as we here have only two sockets, but 5 devices that can be plugged in to it. In order to have no clutter, just stuck all 5 holders below the sockets and moored the 5 cable therein. The thinner / slight cables as toothbrush, razor, hair dryer, etc. This cable holder keep far (about 2 months) without any problems. Up on the cable holder which is to keep the thickness of the heater cable. this is me abegangen already after 3 days. Did it then repaired with a good double sided tape again and has been holding the bomb-proof.
Conclusion. thin lightweight cable geeigente solution. Not for thick / heavy cables!