The TC is directly behind the gearbox somewhere near the middle of the front doors. It can be done without loosening/removing the crossmember if you have short sockets/allen keys, or Tite-Reach extension(or the Strap-On version), or do some custom tooling and cut some sockets (me).
Tite-reach
https://tite-reach.com/products/3-8-...tension-wrench
My TC Post (just FYI, this thread has talks on oil types. Most do not correlate to a F15/F16)
https://f15.bimmerpost.com/forums/sh...2#post28214462
The front reinforcement plat is the silver plat that is under the engine sump. The thing you poke your hand through the get oil filter.
Has a nice view of it missing and the guy pointing at the front diff, in 5th pic
https://f15.bimmerpost.com/forums/sh....php?t=1874581
33306772888
https://www.realoem.com/bmw/enUS/sho...diagId=31_1173