I got 17's on my car currently, my rear arches are just hanging over the tyres, my front is just above. I have no camber kit and my tyres are at 34psi.. I had my tyres at the recommended psi of about 42 and the front tyres got shredded in about a week.
depends on how clean you want it, you could do it without a camber kit but you'll have to lower your tyre pressure to slow the shredding proccess of your tyres