I'm not sure of the location on a 2012, but I can tell you that on a 2003-2006 it's impossible to see from the engine as well as the underside of the car. Stuff is in the way everywhere you look. Here is a picture of where it is on a 2005, in case it helps:
I took this of one in a salvage yard a few weeks ago for my own reference, because my compressor is draining just fine, however it's leaking back into the car. Might be the same problem you're having. By the way, you'll have to pull back the blanket from the firewall to see it. I tore the one in the salvage yard, because who cares haha. I know Ford makes a rubber elbow you can use on the evaporator drain outlet, so the water doesn't roll back into the car. Not sure if they ever started including those from the factory, but if you don't already have one I recommend getting one and trying to install it, because sooner or later that seal between the firewall and the evaporator plenum may stop doing its job like mine did, and the only way to replace that seal is to remove the entire dash, and remove the plenum. You don't want to do that. I removed my plenum entirely recently on my '06 Navigator and it sucked.
Part # for the elbow is: 4M2Z-6A614-AA
Supposedly, on my generation, you can take off the passenger tire and fender liner, and get to the drain outlet from there. I'll be finding out tomorrow or sometime this weekend if that is true.
Sorry I can't give info on a 2013, but all of this may still be applicable to yours.
-Andrew