It was definitely not pretermined when I went, they let people pick and even said you could change your table if you were not happy. I changed twice before settling on this one, wasn't sure if they'd remove the heat lamp.
I imagine the more you go towards the Tomorrowland side the worse seating gets. This picture was from seating about 2 rows of tables in from the walkway. I decided to go with that because I wasn't sure if they'd remove the freaking lamp. lol Unfortunately I can't recall how far towards Tomorrowland the tables were set up.
I wasn't there ridiculously early. They had staggered arrival times it seemed, and my time was about half an hour after seating started.
It could have been way worse for me personally. I was pleasantly surprised. I will admit that I did decide to risk it because I love the Halloween fireworks but was a little worried about the crowd as I was going on a
DCL cruise only a few days later and that seemed like a good option to see my fireworks while risking the exposure to potential germs.