I have the exact device in your link that i use to control a towel radiator element. I wanted the element to come on at certain times of the day to dry the towels, and i couldn't find a proper electric towel rail controller that would wifi control both time of operation and temperature. Consequently, i use the Chosry switch to turn the towel rail on at a specific time in the morning for 30 mins, then turn it off for 30 mins, back on for 20 mins and the off again and then repeat the same sequence again in the evening. I wanted wifi control becuase the central heating (which also heats the towel rail) is controlled by a nest. In the summer i use the electric element, and then the heating takes over in the winter so i wanted to be able to turn the towel rail off when i turn the heating on, and also turn the towel rail off when we went away. I've had it for around 2 years and its worked perfectly.
It uses the smart life app which i use to control a number wifi controlled items from a number of manufacturers and it also gives the electrical consumption as well on a daily and monthly basis.