Through the my.isy.io portal, you can configure the Alexa integration; there you specify the name of the device as Alexa knows it, and what device, scene or program it corresponds to on your isy994i. My family has gotten quite used to this, from just scenes to "Alexa, turn on movie" turns the TV on, dims the lights in the living room, turns out the lights in the surrounding rooms, etc. via a program.
It's got its limitations; Alexa sometimes gets confused because there is a Nest thermostat named "Living Room" and it can't tell whether I mean the living room lights or thermostat (but that's an Alexa problem, not an isy problem). I have some variables that I'd love to have Alexa set directly, but that's not supported.
So, if you're happy:
a) controlling lights, scenes and programs with "Alexa, turn ___ (on/off/brighter/dimmer)"
explicitly linking each light/scene/program with a word for Alexa to use
I bet you'll be pleased. I ordered the dot 6 pack myself.
Bill