As far as I remember anything that holds ammo even those little 'bullet buddies' that hold 2 rounds for mag top ups need to be behind your hip, so I would imagine as long as it is in the right position you should beG2G.
Side note lee valley makes a 1" rare earth magnet in a cup attached to a belt clip that holds 25lbs, I have tried it and will even hold a loaded glock mag. You can remove the clip and screw it to the side of your pouch you have now. The lee valley ones are thinner too, I know guys that have switched to them because you gear can only stick out so far.