Not really a disadvantage to running both but the camber plates will be enough. Camber bolts will give you extra adjustment. I remember reading somewhere long ago in the suspension sub-forum ideally in theory you want to set camber from a lower point (ie:front lower control arms) than a higher point like the camber plates. But the camber plates will be fine. Perfection is hypothetical, real world is complicated.
You can start off with F: -3.0 R: -2.7 0 toe all around. It's only a starting point and I would adjust from there to match your driving style. If you don't have rear LCA the recommended drop in ride height should get you close to -2.7 in the rear. I personally run F: -3.5 R:-2.5 0 toe but it's personal preference.
I'm guessing you're doing 86 Cup next year? See you at the track
