Snarky title: I hid my CD player slot.
What I really did:
This might be one of the duller "what did you do to your 2 series today" posts, but after 4 years of horrible phone mounts, I'm really pleased with this solution. It's a longer than normal "bar" magnetic mount. It's really wide: 7", 1.1" tall. And it turns out that 1.1" is *exactly* the size to fit over the CD slot without hitting any buttons or display above or below. With the phone unmounted, other than the CD slot it doesn't obscure anything. With the phone mounted, it obscures the radio stations buttons (which I no longer use anyway - I've become a spotify/podcast person exclusively).
The phone is *really* strongly attached - it doesn't budge at all, even going around corners at a ridiculous rate (which would sometimes cause my phone attached using a vent mount to flop around, and even occasionally go flyting).
Here's a movie showing my putting it on & pulling it off:
https://www.dropbox.com/s/8l0mtmdwytafb9j/mag-mount.mov