Back in the days I remember using something I guess from the donationcoder website, that would allow me to drag windows into "placeholders" on the screen. I used it to get consistent setups when recording screencasts when I was a teacher.

(And if anyone needs something to setup widows for screenrecording on Linux this is the best I've found, thanks to Robert Gamble on stackoverflow: https://stackoverflow.com/a/288537/9987)