the keyboard is just one part of the ergonomic puzzle- the whole work area - monitor height/angle, desk top height, chair - all need to be set up as best you can for your use.

I found this site long ago and thought it was very informative-
http://ergo.human.cornell.edu/ErgoTi...tationmain.htm

and more links-
https://www.google.com/search?q=ergo...+up&gws_rd=ssl

nice check list-
https://www.osha.gov/SLTC/etools/com...checklist.html