Southeast Minnesota has some challenging terrain in places - anything east of Rochester, MN is pretty hilly. Also, parts of the northwest suburbs of the Twin Cites has many trees and lakes. Otherwise most of the southern half of Minnesota has great chase terrain. The Minnesota River Valley has some hills and trees in the area, so if possible stay out of that area if you can (part of Highway 14 goes through the valley area itself though as does part of Highway 169 near Mankato, MN and St Peter, MN). Cell phone reception for me in southwest Minnesota tends to be somewhat limited in places. I don't lose signal but I lose 3G in places so people who stream will want to make sure they have something boosting signals in that area.
Did I mention that its illegal for out-of-state people to chase in Minnesota? Yep, it is - if you don't say 'yah fursure' and 'oofdah' on a regular basis you will be locked up. Consider yourself warned.
...and just be clear I'm kidding about the last part