I don't like any of these places because it puts strain on the cable/connection, and the phone can come out on corners/bumps. Because of this, and the lack of places to put a suction cup where it's out of the way, I made my own place to mount it out of plexi glass and sign holders:
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Attached it to the tunnel cover, ran the cable under the tunnel. I made it "pretty" since passengers will likely not want to have my phone mount all up in their space. I do most of my driving alone, so it won't bother me most of the time.