Sure thing, my config.cson looks like this:
I don’t know if it helps, but I have 3 monitors, all at 1920 x 1080 resolution, where primary monitor is scaled to 125% while the other 2 aren’t scaled at all.
I didn’t have Inkdrop open when I looked at those values. When I did open it, the top was not outside the viewable area, but the rightmost side was a little bit over the second monitor’s edge into the third monitor, which was not the last position before it closed. I moved it to the center of the third monitor, closed and reopened Inkdrop and config.cson has these new values, and did indeed open partially outside the vertical.