What negative effects does tilting the center channel up have on the sound stage?

Is having a horizon vertically straight( at ear level) the best was to use this center channel or does tilting up a degree of two reduce the quality of sound stage?

I have been working on my center channel set up.

I plan on getting a horizon to match my towers. I will have to build a center channel stand since it is to big to fit into my tv stand. So I want to optimize my set up.

music guy