I have M54 as well and was just up on the hoist this weekend to look into it. I have the same leaks: one at the back by the transmission and one on the front right side. My conclusion was oil pan gasket by what I saw and have read about. I suspect the extra load of a front diff attached to the pan makes sealing it to the engine a tough job.

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2001 X5 3.0i 5-speed manual (sport, tow, cold)
2018 Chevrolet Bolt EV
1981 VW Scirocco mid-engine VR6
1983 VW Vanagon Westfalia
2006 GSX-R750