Hey RJ, how are you doing?

Not sure you'll hear anything beneficial with heights for any Axiom v4 floor-stander. Even the M50s give me a tall soundstage.

Maybe you want to use those M2s for width instead?

If not, the recommendation for heights is above the fronts or just to the inside.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated