Position window offscreen

I want to have a window for a specific app always appear just offscreen (ie. shove it into the bottom right hand corner with most of the window offscreen). Is this possible? I can’t seem to get KM to do this.

You should be able to use the Move Window action to move the window off the side of the screen. The Accessibility API doesn’t much like things being off the screen, but it does work for moving the Keyboard Maestro editor window, for example, so maybe try with a different window and verify whether it is a specific window that is an issue or not.