Oh, that makes sense. I hadn't thought about landscape mode. And with the bigger screen (I use the smaller iPhone 7) that sounds like it would work well.
Looks nice and simple. But doesn't your charger cable get in the way when the phone is mounted? That's why I added the second magnetic mount. It's just as stable, but it adds some height so that the phone sits higher and the cable is completely out of the way of the screen.
I know I'm pretty late to the party, but I found a good solution that's been working really well. Nice and stable, no shaking or flopping around, a mechanical solution that doesn't rely on adhesives (which eventually fail), no screws or dismantling the dash, easy to see and poke at, doesn't...