Unwilling

Greetings,
I'm currently looking to put 20 inch rims on my E61 but i'm not sure if the 35/30 profiles will cause issues. The tyres I would like to run are 245/35/20 in the front and 275/30/20 in the back. I still haven't bought anything, but I have a general idea on the rim sizes that work.
Rims would be 20x8.5 ET20 front and 20x9.5 ET15 rear, or 20x9 ET20 front and 20x10.5 ET15 rear. Although i'm not sure a 10.5j would fit without problems on an estate. Also from what I gathered as information, I would most likely have to roll the fenders since the fronts will rub on bumps and on full lock.
Would greatly appriciate it if somebody can confirm that I can run the 35/30 with slightly rolled fenders. My car is currently stock on M-sport suspension. I'm also not planning on lower the car any further, since I've read that on eibach springs the fronts rub in the plastic arch liner.