Lincoln makes mudflaps for the 2016 MKX. No drilling is needed and the existing plastic fasteners are used.
I thought they might help keep the dirt from accumulating so much on my MKX. The Allure Blue is a beautiful color, but I find it shows the dirt.
http://accessories.lincoln.com/exterior/splash-guards/kit-mudflap-11301.html
http://accessories.lincoln.com/exterior/splash-guards/kit-mudflap-11302.html
I wrote down the model number and found them for 20% off on Ebay.
Lincoln wanted $20 a wheel to install the mudflaps. I saw from the instructions that they install with a single tool to extract the existing plastic fasteners. I had one of these tools that I used on my motorcycle panels, so I thought I would do the job myself.
I'm happy to report the plastic fasteners pulled out and the wheels didn't have to be removed. Be aware that the rear mudflaps did require one screw each on the bottom, which is already on the car. Each mudflap installed with five fasteners too and they used the existing plastic fasteners.
They do seem to keep the sides cleaner and the rear gate is also kept cleaner. Overall, I'm quite happy with them and how easy they were to install. It took me between five and ten minutes per tire.
Here is the link of the place where I ordered. 99.88 for all four mudflaps and free shipping. (without the 20% code from Ebay)
http://www.ebay.com/itm/191818106707?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT