If your going to go with a vertical center, it would be better to get a matching bookshelf, like the M3 or M22, versus turning a center on end, which is designed to be horizontal.
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M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB SonyUBPX800