Cannot get deviceId from alexa echo triggered

[s3frank]

I apologize upfront, this is not a bug report I think...maybe feature request.
But I am trying to understand how to get a unique ID of some form that helps me to know in my flow which alexa echo dot in my house is responding. The idea being to have one Fan flow and dynamically based on the device know which fan to turn on or off.

Any help with that would be hugely appreciated.