I don't like the idea of a drastically different or inferior speaker technology in the center channel. Reconfigure your AVR without a center speaker so the center channel sound is divided evenly between left and right front. Place the left and right front as close as possible to the left and right edges of the screen.
Before I had a TV that I could mount on the wall I used two channel front with a phantom center.
I don't like the different sound of small horizontal center speakers. Currently I use three Identical tower speakers as front left, center, right.
Even with an identical center speaker, I don't like the sound of left and right speakers too far to the left and right of the screen.