The product in the OP looks like a solution to a problem which does not exist. Actually it looks like a problem waiting to happen.
Not Only does it require that the outlet be at a convenient height, but that the person can easily align the connector of the particular device, by feel. It is not as if it comes with a cradle to guide the the device so the connectors align and one can just slap it in place like a cordless phone.
The charging ports on phones and devices can wear out and break, become intermittent. How many people have to have a wire exerting pressure in just such a way that the phone actually charges? Genuine question. I read reviews about my smartphone having this problem and really do my best to not stress the connector/ cord when they are mated.
While cords can get tangles and can also exert tremendous forces on charging ports of devices, the product in the OP with a hard mount seems like it would be all too easy to apply too much leverage to something not designed to handle that much torque.
I rarely handle my phone with the charging cord, or stereo mini plug attached. I paid full price for it and have no insurance, and if I did, and had to deal with phone swapping in a store, well that would increase my interaction with the general public, which I have found to be increasingly stressful.