Desktop keyboards typically have wee little legs to change the angle at which they sit. Do you prefer keyboards to be elevated at the back or lay flat?
Flat, and preferably wireless, sitting in my lap or balanced on my left leg (I use the mouse on my right).
You should keep them flat if you want to avoid carpal tunnel. Only angled if you are using a wrist riser pad.
Tilted and angled so my left hand is closer to myself and my right hand is closer to the monitor.
I like flat better.