I doesn't have much of a drop to even think of rubbing. My car has been lowered 6 mm more (-31 mm off a stock ride hight) on VWR springs for two years before I replaced them with Eibach Pro and I had the same wheels with 5 mm spacers which made it ET45 that time, and I still didn't have any rubbing issues. I think you have to start thinking of rubbing when you drop 35-45 mm (Sportlines or H&R).
The spacers do some track widening. I have the same rims with the winter tyres on now and I use them without the spacers in order to protect paintwork from flying salt. I can take pictures.
If I was to do this again, I would choose 18x8 ET45 for the front and 18x8 ET42-40 for the rear axle if the drop was 30 mm.
The picture below shows 18x8 ET45 on VWR springs (31 mm drop). I guess the Eibach pro should have a similar drop if you use the oem dampers. My car is on Bilstein B4 dampers that push the car a little up due their gas pressure technology. Otherwise the drop on Pros would be like on the image below.
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