A simple grid I use for my dual-monitor setup.
Each of the two monitors has two configurations: vertical thirds and vertical halves.
The left monitor has 1/3, 2/3 and the right monitor has 2/3, 1/3.
If you drop the window in the top half of the screen, it uses the thirds configuration; if you drop it in the bottom half, it uses the halves configuration.
(I've noticed a bug since upgrading to the most recent GridMove version, that occasionally the windows jump to bizarre locations e.g. I just tried to drop a window on the left screen's 1/3 and it wound up on the right screen's 2/3 - I'm not sure if it's the grid or the application...)