[VeryTallMidget]

I havent played around with map editing long time, But I guess its something like that:
Object tilted 10 degrees pointed to north is angles: 0, -10 ,0, Pointed to east: -5.5, 5.5, 270, poited to south: -10, 0 ,180...
If so you could even figure out some usable angels and place ATM so you could use these angles.