That's not that aggressive
I'm running 20x11 +15 in front w/ 275/30/20. This required -3 camber and pulled front fender
And
20x12 +20 in back w/ 325/25/20. Rear has more clearance to go even with that spec
Your rears are fine
You can go more aggressive in front if you want
Caveat:
You MUST get SPL parts adjustable arms to dial in camber and other alignment
Roll fenders and relocate mounting tab
After that you can go much more aggressive
Example:
Work Meister S1 3P 19x10-2 and 19x11-7
CarbonFZ ran 19x10-2 and 19x11-7. He was static and had to run aggressive stretch, but it was done
On bags u have an advantage as well