After I designed a stand for my iPad mini, I adapted the design for my iPhone XR.
Here’s the one for the iPad:
I needed a separate design as the iPhone is slightly thicker and when you get messages, the vibration can cause the phone to move and eventually slip out of the stand. Having four tabs to secure the phone is a bit less minimalistic, but great to turn the phone from portrait to landscape - without having to take the phone out of the stand.
If you like my design, consider getting it from Etsy:
(shameless plug - I know…)