I booked ADRs for my parents' trip taking my sister and her 4 kids, so 7 total... for middle october a few weeks ago, so about the time until the trip starts.
I was able to get for them:
Chef Mickey's 2:35 brunch on their
MNSSHP day (they will valet park at the contemporary)
Crystal Palace 5:05pm on their MK day (it's a party day so they will be ushered out after dinner)
Akershus 3:10 dinner on their Epcot day
Tusker House 3:55 dinner on their AK day
Now they picked those park days based on the ADRs I got for them. I think if you're booking much less than 180 days out you kind of have to plan around your ADRs and not the other way around. Since you haven't made FPs yet it should be easy to do.
I was also able to get a 7:50 1900 Park Fare dinner (cancelled, too late for them... they'd MUCH rather eat 3-4pm and won't eat past 6:30), Akershus on another date, Garden Grill on their second Epcot day. They are going for more than a week but only wanted sit down character meals and I feel I got them some of the better ones.
if you're arriving 11/26 that sounds like it's thanksgiving time? which is super busy and probably why. october is pretty busy too but not a holiday. But I was surprised at how much I was able to get for such a large party.