Suction cup mount is what I'd go to but I don't know where you'd put one in a mini since all the surfaces are rounded.

Maybe a cupholder mount? I've seen some of those that are kinda tall. But I just put my phone in a cupholder and with the rubberized case I have it doesn't fly out or anything. Not even on b roads.

I have a similar issue in my other car where the only flat surface for a suction cup mount is way up in the center of the dash. Might as well have it on the windshield at that point and blocking viz is a no go for me.

I got this a while ago and it's worked out just ok. The problem I had at first was where to put it.

https://www.amazon.com/gp/aw/d/B0893BDM73?psc=1&ref=ppx_pop_mob_b_asin_image