I have in my 2013 A5 the exact same set-up: HRE FF01 - 20x10.5 - et35 with 285/30/20 (Continental DSW). Having the same offset they look the same back and front. Also I have 5mm H&R spacers all the way around and no rubbing under any circumstances. Not even in my very sloped driveway. I have them for more than a year now....
What I like the better is the weight of the wheel/tire, being that big, didn't increase that much when I switched from my 18" (18x8.5) OEM. Just 2 ponds per corner and that is when I weighted the new HREs with new tires vs the OEM with half live OEM continental tires.
I believe this is a good deal including tires. These wheels run for a lot more without tires..... I'm surprise they are still for sale here....
Here are pictures in my car (with red caps instead the grey-ones) and also the weight comparison right after I switched the wheels. (pictures are before I cleaned the wheels again after installation... sorry)
OEM
HRE's
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