Tweeter or hf part of drivers to the outside, generally.
Bare minimum of 30 inches from back wall. 48" is more like it. Keep 'em out of corners.
They need 'air'.
Always have some toe in. Experiment. You can face them right at the seating position of 'cross' them in front or behind you.
Adjust for image and staging.
If used in stereo only, IE, no TV in between as I have, you may want to put some diffusion between the panels on the wall...
I have seen backwave modifiers for Maggies, as well, since some people think that the back reflection causes audible problems. I may experiment with that, using a 2x or 3x bath towel draped over the back of the speaker, on the tweeter side.
The folks over at Cardas use a mathmatical theory for setup which works. At least it has for the last 5000 years.
They may have a special procedure for bi/di poles.
Experiment to your hearts content. Send wife/kids to movies for a couple hours so you can have some peace and quiet to experiment.