Nobody knows for certain where he does or does not want to play. It is all just speculation.
The most obvious place is Florida. His GF goes to school in the area and he owns a condo nearby. Second choice would probably be other teams close to that location.
There is speculation that he wants to play at home in Detroit. Personally, I don't see a lot of indication of that.
I also don't think that Canada is out of the picture. I think he wants a big city, major market. Just a pure guess, but I doubt he would want Montreal. That leaves Toronto as a possibility.
I think NY would suit him. So would Philly. I don't know if NY would include NYI and NJD or not. Dallas might be OK and so might California. Not particularly close to his GF, but big cities, nice climates. Vegas has the bright lights and tax advantages. It has good travel connections to just about everywhere. He might like that.
I think money is a big part of it for him too. Wherever he goes, I don't think he signs any team friendly contract.