I purchased the EcoLink Z-wave Plus version. https://www.amazon.com/gp/product/B01N5HB4U5
I connected the switch to the Guardline
I attached the EcoLink sensor directly to the back of the Guardline and ran the wires to the sensor.
And this is what it looks like from the side view when finished.
It works like a charm and now I know when people are coming back my driveway. I have the Smarthings app send me a text message when the sensor is opened.