Typically the mags go side by side, not upside down. Due to the location of the Scorpion Evo ejection port, you don't have to stagger the mags, either.
Two couplers per mag is for durability reasons: One to anchor the bottoms together and one in the middle-ish to stabilize. Singles will bend/slide easily.
Tip for installing the couplers: Remove the baseplate/spring/follower of the mags and work from the bottom up. Pull from the coupler web between mags.
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Mag couplers are ideal for starter mags (mags kept in the gun) in that it gives you a bunch of on-board ammo to deal with problems before you have to resort to pulling reloads from your load carriage (belt, bandoleer, bag, etc.). Useful for immediate action handling those situations where the democrats/disenfranchised urban youth/looters/zombies don't give you a chance to put on all your fancy nylon hero gear. 2 mags on the gun and 3 reloads are plenty for 100% of the .001% situations you'll encounter.
Not sure if couplers are USPSA PCC legal but I can't run PCC with my braced Scorp Evo pistols anyway.
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Everything he said. ^
Mag couplers by design do 2 things. Hold two mags together, and SPACE them so they can be inserted into the gun without interfering with each other. The mag change is reduced to out and over 3" and back in. It requires the least coordination, and is probably the fastest reload out there. It is the ideal tactical reload as well if you want to top off anticipating the next exchange. When exhausted, they don't go back in a pouch, they go on the
GROUND. (Shocking to some I'm sure)
If you are in a 4th world trash can, or perhaps cruisin' down in Dade county where "flippin' the clip and wettin' up your whole set" is a common place occurrence. Then you're taping the magazines together, which means they
do not have the spacing to be inserted and be in the same orientation. While it accomplishes the same idea of more initial ammo on board and a reload if no other mags are present...
I've taken a couple of classes with pistol and AR. What was taught to me is that you want to streamline your manual of arms for speed and effectiveness. Meaning mag changes should be done by your non dominant pistol gripping trigger finger at the ready hand. Now try to change mags with them coupled upside down clipped together the only one way you can. How do you rotate the mags keeping proper orientation of loading without twisting your hand and arm awkwardly. How is that streamlined?
Now couple them side by side and see how much faster you can do it using the same one hand.
^ This is why that sucks.
Some smart people in here.