Some commercial keyboards come with stand built in but the slot is usually too narrow to accommodate iPhone and iPad with case. I decided to design and print my own; one with a little wider slot channel to accommodate cases.
No support needed. Works great for me. Wide enough for an iPhone and an iPad to sit side by side (ok, it's a bit of a squeeze).
Your choice of material and color to show off your taste.
I hope this serves you well. :-)
Edit: A model with a no holes version is also added. Somewhat of a waste of filament in my opinion. Besides, the hexagons look cool.
The author marked this model as their own original creation.