EDIT - I have added a new file without "LUCAS" printed on the iPhone holder.
Here's something that I put together after I picked up an iPhone 11 Pro Max. It didn't fit in my old phone stand so I printing this one that will hold it. I had to redesign it a couple of times after trying it out. I cut away the notches in the base so you can still swipe up to unlock the phone or exit apps. There are channels underneath also to route a charging cable too if you want to charge while it's on the stand. I use a cable with a right angle on the plug so it is designed to suit that kind of charge cable. I haven't tested this with the stock cable so it might not suit that one.
You don't need any supports with this one if you orientate it as shown in the cover image.
I have named this design the "LUCAS" ;)
I printed this on the Flashforge Adventurer 3 using the standard PLA settings with a 3mm brim and 10% infill. It printed in about 4.5 hours.