I'll bite, seems harmless enough.
If the Earth is flat, it doesn't change anything, the phenomena that exist still exist, and the orbit of the 'satellites' is still in the same place; thus, they still have to point at it; simple. The
orbits themselves, now, may function differently in a flat Earth than with a ball (still a circle, but on a different axis), but they'd still be in the same
place. There is a lot of space between the north pole and the equator after all. I don't own autocad, nor live close enough to either location, but that would be a simple case of triangulation if you get the angles to know where the satellites are; not sure how much this would help to 'prove' flat or globe, though.
Edit To clarify, geostationary orbit; I don't know how/if Flat Earth 'turns', but if it
doesn't, then the satellite must be stationary as well (read:
balloons). If the FE
does turn, then the orbit must follow it, as with the Globe. Hope that sounds more simple.