First off, if you go back in this thread, there are a few folks that came in with driving experience on the 4WD Durango, and gave a lot of credit to AE on this car. I have a 44.1 as well, and this 44.2 just rocks. It drives great, jumps great, corners great with the kit setup. I'm looking forward to trying to dial it in even further, but my car was so much fun and well handling when I drove it for the first time this past Monday. Got about 8 packs through it, had a blast.
Regarding your Tekin motor mounting, since the chassis plate heights hasn't changed, you'll probably find the answer in the B44.1 thread. You can use any 2 opposite holes on your motor for mounting, but like you said, it's all about the angle of those circuit board tabs coming off your motor and fitting. I wouldn't say it's so much about being below the top chassis plate (despite what AE states) but more about it fitting in there between the body. I've snapped a quick phone pic to give you an idea of how much clear area there is around the motor tabs / body on my build. This is the included Jconcepts body. I also have a ProLine Bulldog body that I could check out to see if there is more clearance room (or not).
Get some rest, search the B44.1 thread for "Tekin", and work on the motor install tomorrow. It can't be coincidence that most build / maintenance mistakes I've made on RC cars is late at night when I've been going at it for a while, or just flat out mentally tired.