As the Owner and Inventor of Cable Munkey, I am happy to answer any questions you may have about them. In the instance of a fire, yes they will melt at some point, it is a 30% glass filled plastic so there is some extra rigidity and heat resistance built-in. I think if you get a fire hot...
Make sure to look at support and warranty options as well. Knowing you have a good warranty on a fixture you expect to have for a number of years is important.