Sonoff curtain controller - My experience

Two weeks ago I purchased the Sonoff Zigbee Curtain Controller. It is an interesting concept and the system is economical ($85 ). Unfortunately the cable keeps getting stuck by the curtain hooks (that hang the curtain on the rail). I tried eveything but now I am returning the controller.
My guess is that the system would work well if the curtains hang on rings with a rod holding the rings .