Well falkens are known to be narrower than some others tyre brands even if the size is same, but you dont need use falkens if you dont want to.
This car have 235/40/18 falkens and 18x9.5 et35 front wheel
http://www.m3post.com/forums/showthread.php?t=478510
More about same car bottom of the first post.
http://www.e90post.com/forums/showthread.php?t=468511
^This is the guy who helped me to get 9.5 allround.
H&R is a good brand, i like the ride quality.
Like i said if you want wider tyres to rear its possible.Its your personal preference. Im happy with 235/40/18 at rear.
Here is e91 with 235/35/19 19x9.5et20 rear. Its very low
http://www.e90post.com/forums/showthread.php?t=687073
And about that blue car
It has wider wheel
10.5 et38 at rear with 10mm spacer so final et is 28
10.5 et28 is going to stick out only 5mm more than 9.5 et20.
And he has falkens 275/30 which are little bit stretched to that 10.5 size wheel and round sidewall and rear fenders are rolled.
He doesn´t mention anything about camber adjusments.