My concern is that your are relying 100% on that little lightning connector to hold up your phone without any additional support. That’s a pretty small piece of metal holding up the phone and on the other side of that, it’s a pretty small socket on the phone that’s taking all the force that may be applied to it…
Mind you. the more I ponder my concerns the more I think you’re right. The old 3G/S and 4/5 Apple docks had a small molded section that the phone sat on which felt like it was providing some sort of support, but probably not much to speak of really… and they survived just fine. Also the Apple stores use these docks for everything and they seem to work very well. Of course, they can always swap out a busted phone/dock quickly and easily should they ever have to and they only have to last 12 months… although they probably get a hell of a lot more use and abuse than my daughter is going to put it through.
Personally, I’ve got the Twelve South Hi-Rise which has a little adjustable backrest. It uses your stock Apple cable and comes with a couple of little inserts to lift the plug higher in the base so it works with many different cases. I’ve actually just had to dig the adaptors out of the drawer because I’m using a different case on the new iPhone and it’s a little deeper.