You will definitely need a camber kit that will allow you to pull the wheels in for tucking. With those specs, I would recommend that you roll or shave the fenders, front & rear.
I only say this because you want to tuck the rim. I've dropped my car and tucked rim and my camber kit is set to stock length, but those were on 17x9 +30.
I have ran x9.5 +30 and had no issues with rubbing at all and I never rolled or pulled my fenders, but I was running 205/40 tires. I cannot recommend a tire size since I'm not that familiar with running 18s, but if I had to guess, a 215/35 is your best bet. I'm not sure that they make 205/40s or 205/35s, but I've also never searched.
Your most work invested into this will be the front fenders. If you plan on going that low, you are going to need a slight pull for sure unless your suspension setup allows you to adjust the camber on the plates. Its almost ideal to run bags for something like this, but Gabe ran x9 +10 on his and he was static so...He also did a lot of work to get them to fit too. I believe he is now running 18s but his are x9 +30 and tucking just a little rim. But essentially, the tire size also has an affect on your desired fitment.