Brian, This Basics forum is primarily for learning the ins and outs of this hobby. If you want recommendations on hardware, our Moderators prefer if you post a question on one of our other Forums. The Audio/Video Sources Forum would be the place for recommendations on a DVD player...
Hi Brian, A matching speaker to your right and left is your best bet, as they will sonically match. There’s no reason to turn the in-wall center speaker sideways. Install it upright, or if it’s above ear level, upside down. They just do the low profile thing with freestanding center speakers...