Bro. Your 19x11 +18 rears v my 20x11 +15 fronts are just 3mm diff. Thats nothing.
This is what it looks like:
-3 camber
275/30/20 (slight stretch)
rolled fender
shaved bumper tab
I am moderately low, your car may not be same height
Zero rubbing unless i was a moron trying to hit a speed bump at full speed or taking some extreme incline ramp
Basically your fronts (19x9.5 +15) are an easy peasy fit with a 245/40 (same as stock) tire, and you won't need -3 camber. The adjustable SPL arm, however lets your alignment guy dial it in more precisely. Factory camber is around -1 only. You may not even need a fender roll if you add negative camber.
Your rears have a ton of space. Folks have run 20x11 +0 with 285/30 in back no sweat