Why don't you try it, and tell us what you think.
While you're at it, I highly recommend experimenting with the distance of the speakers from the sidewalls, and front wall as well.
In my very limited experiences, I've always preferred having the speakers with a considerable amount of distance from the front wall, most likely due to any specific SBIR.
As for typical monopole speakers, I've also normally enjoyed a somewhat aggressive toe-in. However, I believe toe-in and any possible effects that may give are dependent on the speaker itself as well.
IMO, there's only one way to find out: Try.
otherwise, an expert I trust would say that the axes of the speakers would cross right in front of your face. Try that as a starting point.