I can send you some files if you want to test out fusion studio beforehand, or you can get some from 360rumors.
Didn’t think about magnet mounting as a bit afraid of paintwork damage, but it sounds quite sturdy.
Most of the footage I’ve seen from Fusions looks ok zoomed out (as expected), but loses all detail zooming in. Colours are ok and dynamic range exists, but the detail is just not there, and no sd card would fix that.
If the rumours are true about the next fusion, we shouldn’t expect a bump in image quality…