So David,
Do you like them?? I have mine rocking with an ARC Ref 5 pre, the EMM Labs TSD1/DAC2and a Krell Evo 403 all wired with Transparent reference XL and it is a sweet sounding rig.
I realized I never answered one of your questions, as for positioning they like some space behind them but can do without as they are front ported, I find I like them almost straight forward with just a tiny bit of toe in.
Hope you are enjoying them!