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As one who did the maths ages ago to write a two-star alignment routine, the maths suggests the alignment works best with:
a) one star as low to the horizon as possible due east or west, this is effectively the azimuth reference; and
b) one star near the meridian, ideally at 90 degrees angle from the first star; this is effectively the altitude reference.
Personal experience with the Synscan handsets (I have an AZEQ6) suggests it is valid.
It's not particularly critical though and it can work with the second star near the pole as long as the other is close to the equator. If the stars are closer together the accuracy is poor.
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