I was able to sneak off for a few hours today and mess around with the side skirt extensions that I received earlier this week. I chose to mount them pretty close to the car, with only a few inches showing to give the car a widened stance in the right places and add a little more depth to the OEM BMW Performance Side Skirts that I paired them with.
I ended up sourcing my own hardware to secure the extensions, did not use any type of tape, and did not utilize any of the stock location hex key plastic bolts along the underside of the side skirt. These are mounted rock solid and aren't going anywhere. Total installation took a couple hours taking my time and was much quicker on the second side.
Here are a few shots following final mounting -- more to come when I get the lip installed, brakes on, and the car cleaned up.