All short-throw projectors use extreme angles to either side as well, even if the vertical is directly centered like you asked for the left and right sides (and still the top/bottom though to a more even degree) are still using VERY steep angles.
You know how tight a flashlight beam is? Now widen it to a projector that's throw distance is 3X that of its screen-width..a bit wider cone/more extreme angle than a flashlight, but often decent for a high-gain screen. Now switch to a standard throw that's throw distance is about 1.5X the screen-size and all the angles become much more extreme (too extreme for a high-gain screen to work well). Now cut it in half again, creating much more extreme angles on all sides, and that's the sort of projector you'll be working with because you won't have room for a longer throw.
A picture might make this much easier to visualize, so let me know if I babbled coherently enough to make any sense.
Basically because the projector is still super close, the angles will still need to be just as extreme either way and changing offset/vertical placement is just going to aim the wide cone in a slightly different direction. Plus it'll put the projector in the way of the screen for front-projection.
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