Your trio of centerchannel speakers will do just fine as L/Rs but will have the correct hi-frequency-dispersion pattern only if they're arranged horizontally. Ever notice that some 'center-channel' speakers have their tweeters (and MR drivers, too) mounted on a board that can be rotated 90 degrees? That's so the speaker can have correct dispersion whether mounted horizontally or vertically. If you use vertically a centerchannel speaker designed for horizontal use, the sweet spot will be very narrow.
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