It does allow me to add zwave switches & devices to my Harmony Hub Activities, but the software doesn’t allow Alexa to directly control these discovered devices without having an activity created. I’m using these to control a couple ceiling fan control wall switches. I’m unable to say “Alexa, Set Ceiling Fan to 75 percent”.

https://www.amazon.com/Logitech-Harmony-Extender-Compatible-Remote/dp/B00TA4HV7M