Sorry, dude, the site is not the problem. Your suspension and/or choice of wheel/tire combination is the problem. If your setup allows a tire to contact a fender under ANY circumstance, it's nobody's fault but yours. I'm gonna bet that your car wouldn't have any rub issues as-delivered from the factory with the factory-specified tires. You've changed something (or things) to allow that to happen.

FYI, there are dips at SPC as well, and occasionally they come into play on an autocross course. Just one of the many things* an experienced autocrosser looks for when they walk a course, especially if their car is sensitive to such things.

* a long list that would include things like general course navigation, changes in pavement type or smoothness, sand and dirt, humps and bumps, dips and ruts, broken or deteriorated pavement, puddles, changes in pavement camber, painted lines or other surface treatments, and anything else that could affect how the course should be driven in your particular car.