I had a client go a couple years back and just looked at what I did for him:
He stayed in Milan and hired a private chauffeur to the drop off point because he didn't want to do the train. I think there was quite a bit of traffic but he was comfortable in his car. He did the Ultimate Hospitality with Parabolica seating due to the ease of getting to the seats.
Another good option I saw this year was the Schumacher lounge w/ 6A seating, it's not cheap though.
If I was going and staying in Milan I would probably take the train and do the Fans Club (which includes outer Ascari seating). Over half the cost of the above two packages. Just don't know if there are still tickets available.
Outside of that I'd end up reading every guide out there to figure out the best seats outside of the hospitality packages, but I haven't looked into it.
Happy to answer any questions if you have them.
Luxury & Adventure Family Travel Agent
Personal Travel Concierge
Europe • Africa • S. America
www.voce-travel.com
Kyle.regitz@fora.travel