How big is the
stage? How far away are the performers? What are the performers performing (band, chorus, drama,
etc.)? Is it for reinforcement or recording?
Personally (and IMHO), I find overheads for reinforcement to be about as useful as dropping a brick on my head. Depending on your space, they are a pain to position to find that sweet spot of
GBF, and usually don't ever reproduce enough for anyone to be happy. For recording they can be awesome. For reinforcement of large acoustic groups I much prefer using a pair of condensers placed as close to the ensemble as possible on tall
boom stands so you capture wider
swatch of the reflected and direct sound. This is especially important for bands and orchestras where your sound sources aren't all facing down center
stage. However, YMMV as the saying goes.