The offset will be perfect for your corolla. Im running the same offset on my wheels, look at my pic below, and im lowered quite a bit. I have had no issues with rubbing at all. Like I said, they put those wheels with that offset on the corolla xrs and they were perfect. Good luck.
Ohh, and chrome, nvm, they should sell quick on cl though... there are lots of people with poor taste out there scouring cl for used bling... but post up a pic of them here and I'll try to give you the brand, style, offset, etc... i know my rims pretty well... who knows, you might have a gem or a turd, only one way to find out.