Added the Rythmik F18 to my living room HT last night. I didn't get to use the miniDSP yet, and the L12 on the left hand side of the console isn't even hooked up, but I got it physically in place. It really wasn't as troublesome as I expected for a 130lb subwoofer. Boxes slide easily and with the hand truck I had no problems getting around the back of the house (use a ratchet strap!)
Final placement of the L12s is TBD, but I'll try them like this and see what happens.
Turns out 18" is HUGE. Even with the mockups it always feels bigger when you have it there for real. I'm pretty sure the dog will want her bed moved now, too.
WAF was a huge concern but I found a hack. Use the outer box to make a play house for the kids and everyone is happy!