Probably you already know how you're going to go about it, but I guess normally the speaker delays are captured from wherever you pick the MLP to be, which to me should be the center of the listening area. Then subsequent mic placement can be as broad or tight as you think it should be at different elevations.So far, I’ve only used the system to watch the AbuDabi Formula 1 race off my DVR. I haven’t set up diddy yet, still dealing with wiring and all the spousal duty projects (in spite of her despair over the theater being a work space at the moment). Sound was not impressive, but again, zero setup, just passsing signals.
The room has four seats, with the MLP in the left front, so I do move the mic around when I’m running the calibration. Back right is way too close to the back right speaker, but back left sounds pretty good in 5.1 - in fact that’s where I sit when I’m listening to surround sound alone. The front seats have high backs - something I hadn’t considered when I bought them 15 years ago.
I confess I don't know much about Audyssey and their recommendations. But at some point down the line I'd highly recommend getting a minidsp UMIK-1 mic, they have a good rep and come with calibration file.
Usually around the $100 price range.
But I know for now you just want to dial in what you have as time permits.