Consider not using a center channel! Jim Smith's book of set up tips, Get Better Sound, is a terrific buy and full of good ideas. One of those is to not use a center speaker, if your AV receiver can give you the option. For you, all you need to do is try it, no cost. Putting a vertical design on its side will not match anything else, I use five matching speakers myself. So, try going without and see. Better yet, bring in someone who doesn't care, who has no preconceptions, and see if it pleases them.