Might also want to consider spacing them on 2 stands, positioned to where you think they will pick up the best blend of sound from the sources on stage.
I'm going to have to agree with this one. I think that many people are under the impression that if their mics aren't arranged according to the .jpegs on some oade.com page, then their rig will explode upon hitting the 'record' button.
Onstage recording is tricky - depending on the placement of the onstage amps/monitors, the available space onstage, and where the performers are going to be standing/walking, the soundstage that you're trying to capture will change from show to show, venue to venue.
That said, when I record onstage, I try to eyeball the spots that will capture the best blend of the onstage amplification, and point my mics at that spot (I use cardoid caps). In a perfect situation, I'll use 2 tabletop stands (i.e. the same type you'd use to mic a kick drum), and split my mics however I think is best. If floor space/being low profile is an issue, I use one stand & the t-bar.
The 'standard' mic configs (ORTF, DIN, XY) are useful when you're trying to capture an audio image from a distance (like a PA stack from the section or FOB from a dance floor), but I simply think they're not as useful in situations when you're recording from "within" the soundstage.
(remember: before it was given the fancy name "ORTF", it was called the "Point Le Left Mic Thees Way, And Le Right Mic That Way, And Let's Hope Eet Sounds Good" method.)
in short:
use the force... you may invent something cool that we'll all make a nerdy abbreviation for.