Kitchen range Hood/Vent in attic - How to Wire?

I know I really need to figure out which Hood/vent I'm going to get, but I'd like to get the Rough Electrical Inspected soon and don't know what I need as far as a Kitchen Range Hood/Vent where the motor for the Vent is in the attic.
I have a 12/3 that is going to the Range. I was going to use one circuit for the Range (its LP) and one for the Hood/Vent. Do I put a Junction box in the Attic that the Hood/vent plugs/wires into? Or is it in the Cabinet? If its in the Attic, are there control wires that connect to the Motor? What about Lights?
Can Someone recommends a Hood/Vent where the Vent motor is in the Attic?
Thanks, Scott<-
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You will need to get specs on whatever model you're going to buy. If it has lights in it and a remote fan, it'll require wiring to both locations

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