Sure, If you have the room. I have a big projector screen it sounds more convincing than a single. To err on the side of caution, I wired mine in parallel.
I think the only reason companies make special center dchannel speakers is so that they will not take up a lot of height, and fit on top of or underneath the monitor OK. If your speaker fits under or on top of the monitor, I would say it should be better than a center channel. It seems like all the specialized cabinet design that manufacturers tout as a reason to buy their speaker goes out the window with center channel design.
Using a main speaker as a center is ideal and usually superior to using most dedicated center speakers. However, you should use only one, not two, or the radiation/interference issues common to horizontal speaker will be encumbered.
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