Hi you might be interested in this. I build it for LaunchBar. But since it is just an applescript you should be able to make it work just fine in Alfred with just a few changes. It's a few lines of code. But it should cover pretty much all the bases.
# http://superuser.com/questions/331313/how-to-automagically-move-windows-between-monitors-with-one-keystroke
# https://stackoverflow.com/questions/6565703/math-algorithm-fit-image-to-screen-retain-aspect-ratio
# https://forum.latenightsw.com/t/get-sizes-of-monitor-s-via-applescript/1351/10
---
use framework "Foundation"
use framework