Question about Sp Connect Phone Clamp

well - the iPhone Pro Max with case - at least with the Torras UPRO case - is actually too big for the holder. Doesn't really hold that well.
Torras UPRO Ostand Pro iPhone 15 Pro Max (iPhone 15 Pro Max)

I have measured the holder, completely unclamped. Maximum width is 7.7 cm

No, it worked for me even with the cover on. However, I wouldn't recommend the mount for very rough roads. (But it's not designed for that either)

Use it with the same smartphone. Very satisfied so far.