Fogs in the upper or lower grill? If lower, then you should consider buying the kit that puts them in the stock left/right position (replaces the block off covers as seen in the picture you posted in the link). I have this kit; it uses factory pieces, includes the stock headlight switch for fogs, and as a bonus, you get the automatic headlight operation (all Mustangs have the sensor for this at the center of the dash; just need the headlight switch with the position to turn the headlight switch to).
I do like look of the GT fog lights in the upper grill, which is why I plan to convert my front bumper to a GT one. The aftermarket has not been there for GT type grills that replace our early, pre 2013 V6 Mustangs. in 2013, Ford went to the same front end for all Mustangs, so the V6 benefits with the aftermarket offerings.
It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.