I've created a Group called Patio Fans that groups 5 fans (GE Z-Wave). The group works but Alexa sees Patio Fans as a dimmable color bulb, sets its type to Light and doesn't allow for it to be changed to Switch. Because of this, when you want to toggle or dim the Patio Lights, Alexa thinks the Fans are lights and includes them with the command.
Thanks, Glenn