I created a 20º tenting platform for the Chocofi split keyboard. It's designed to fit the Chocofi case you can find here:
https://github.com/pashutk/chocofi
To print the other side, just mirror the model horizontally.
I haven't figured out the best way to print this, but I printed it upside down with supports, like you can see in the last photo.
I put silicone anti-slip pads on the bottom.
The author marked this model as their own original creation.