if you're trying to do it in the front, there are 2 frame rails that are the perfect spot for a non-bmw jack AND jackstands. I wouldn't personally use any other spots. I did make the same mistake as you though, I used jackstands around that little lip thing, and it crushed it up like 1/8 inch.
After working on 3 different types of bmw chassis - I have found that they do NOT have ANY good jacking points.