I know horizontally placed center speakers are usually frowned up, in my case though unless I replace my projector screen with some AT material, I'd have to place the center S2 horizontally lower in the cabinet, and tilt it up to point towards ear level.

I can't really test this, because I don't own any speakers yet. I was first going to place an order for a pair of S2 for L and R, and later order one for a center.

But it appears when ordering the Sierra 2 for a center channel / horizontal placement it comes with the tweeter rotated 90 degrees, so I will need to make a decision which version to order.

Anyone has had a chance to compare the two versions ?

I think I read a post here that if I understood correctly, it makes it seem like maybe I can rotate the tweeter myself later if needed, so maybe it does not make a difference which version I order. Is that correct ?