Sonus Faber , Should the Tweeter be in or out ?

I have both the Concertino's and the Concerto's and both the tweeters are off center with the bass/mid in the center position. Also front port.
I never thought about it till now but should the speaker be placed so that the tweeter is in the inside position or the outside position?
Or does it really matter and falls back to what sounds best to me.
Dave