Paul,
For the fireworks at the Magic Kingdom (Wishes Nighttime Spectacular), I recommend leaving the park. I think you will find the best fireworks views at California Grill in the Contemporary Resort, or 'Ohana at the Polynesian Resort. If neither of those works for you, then I'd try for Narcoosees in the Grand Floridian and hit the beach for the fireworks, or the Crystal Palace in the Magic Kingdom. Crystal Palace is a Winnie the Pooh character meal near the park hub.
In Epcot, the Rose & Crown table service restaurant in the UK has a view of Illuminations, and Cantina de San Angel quick service in Mexico does as well. Plus it's right beside a lovely margarita stand. :)
As for timing, I can't really say right now. Park calendars are released 6 months in advance, so if you check
here next month you should be able to see the schedule for Wishes and Illuminations during your November trip.
Happy planning!