No. Sound emanates from a single point. Music might be recorded in a way that direction and range from where it was made, to where it was recorded, has an effect on the final sound. It certainly doesn't initiate from 3 specific points.
I didn't say you can't create a center stage, I said it doesn't make sense in a vehicle. If you're going to make a center stage then why not an upper and lower rear center, or an upper middle and lower, front middle and rear, right and left. Why not create a 50 speaker atmos enviroment?
The speed of sound is 343 meters per second. Which is about .003 of a second for that one meter difference between you hearing the left and right speakers. YOU CAN NOT HEAR THE DIFFERENCE IN TIME.
A center channel would help out IF your left and right speakers aren't placed to where both people can hear them, with or without people in the seats, when they are blocking the speakers, that is the only reason for it. If you have a DSP, and WANT TO add one, then fine tune it in, you could create that scenario, but why would you?