The most ergonomic position is the next one. I have a mouse for each hand, and a track pad, and a sit/stand desk converter, and four chairs, some with and some without arms, and monitors on arms that can be easily repositioned. I'm always adjusting something, or using a different device or chair, and I alternate between sitting and standing a couple times each day. I also have a timer to remind me to stretch and takes walks once an hour. I guess what I'm trying to say is, you can code more on nights and weekends without spending too long at the computer (in the same position).