No holsters are specifically approved for IDPA, they did away with that a year ago.
Holsters must meet requirements given in the rule book.
If a belt holster, it must be a strong side holster vertical or with muzzle to the rear (FBI) cant, not adjustable while worn. It must hold at least some part of the gun within 3/4" of your body. It may not have a visible gap between holster and belt or form one between belt and body.
Looking at the Sidearmor website, I doubt the Modular would pass, but the Vertical Scabbard probably will. Also BladeTech, Comp-Tac, ReadyTac, Talon, and probably some others. The Uncle Mike belt holster does not pass, but the Paddle does.