Orthographic object alignment and multiple resolutions

I’m trying to make it so that when I have an object placed at the top of the screen, it’s at the top of the screen regardless of the resolution. When I plop down an object at the top of the screen for a given res, but then change that res (like portrait iPhone 5S versus portrait iPhone 4) the object is no longer top aligned anymore. I’d like to be able to ensure that an object I place is always going to be at the same offset vertically. I’m using an orthographic camera for this centered at 0,0,0.