Virtual ergonomic keyboard for ipad pro?
If by ergonomic keyboard you mean a split keyboard, you can do this natively on the iPad.

To do this:


In the bottom right corner of the keyboard there is a key with a keyboard icon (with a black down arrow)
Tap and hold that key
A toggle for the split keyboard will pop up (or, if it's already split, a choice to unsplit the keyboard will appear instead)


NOTE: If the above steps don't work, first go to Settings > General > Keyboard and toggle the Split Keyboard option on.