If you go Radion, I'd go 2 XR30s oriented perpendicularly with the pucks of each fixture going front to back. But then again, if you're spending that kind of money on lights, consider the GHL Mitras LX7 as well, again oriented perpendicularly. You'll save a couple of bucks per fixture and will have 12 total point sources of light with 2 Mitras as opposed to 4 point sources of light with 2 Radions which will help with further shadow reduction.