Haven't heard much of Auro since release.
The set up is very similar to ATMOS\DTSX. Most any Dolby guideline should be sufficient.

With the amount of H.P. woofers you already have. Something with more low end like M3 might be better suited. Someone on the forum here was at a show where they used all 8inch drivers in an ATMOS demo. To which they thought it was spectacular. compared to drivers without BASS.

Would be cool to hear of more people with AURO setups and how they compare to ATMOS. Since most of the ATMOS is quite minimal. The overheads mainly sit idle.