I am in the same boat. I've so far tried:

• Magnetic mount - don't like it on the left
• Dash center clip - blocks too much of the dash or has to stick up too high
• Vent mount - not compatible with these vents
• Cup holder (iOttie) - great placement, but interfered with the other cup holder, and I don't want to lose either
• Currently trialing this cup holder mount that provides a bigger holder still - Good placement, cup holder is honestly a little too big and it wobbles more than I expected
• Eyeballing this cup holder mount if the last one doesn't work out

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I figured that I'd make a compilation post once I find one that I really like.