I’ve not personally tried it, but after a fair bit of research I was looking at the Steinberg UR44C to pair with my 11 inch ipad pro. Was planning to sit the ipad on top as it has a really similar footprint to that ipad.
As I said, never actually tried it in the end (I have other interfaces and just rarely feel like recording straight into ipad) but pretty sure it ticks all the iOS compatibility boxes.