Yeah... Being a stagger stacked mag, you really need to make sure that the manufacturer indicates that it will indeed work with a Shield.
I found DeSantis leather double pouch on Amazon and it does work, but even with its tension adjustment screws, it needed to be stretched quite a bit in order to NOT be a nightmare to pull the mags out.
(cram the mags in, crank down the screws, let it set overnight, tighten another rotation or 2, let set again.)
One thing that's nice about it, is that you can wear the mags upright, or sideways. I like having the mags 'cross-draw'.
Amazon.com : Desantis Single Stack Double Magazine Pouch, 9mm/40, Black : Gun Magazine Pouches : Sports & Outdoors