Yes....you can make ADR for parties of 7 and you should all be together. When I called to make the reservations months ago, the CM who helped me at one meal said there was no table for 7 at the day and time we wanted, so she could split us up or we could look for a different time/day.....which we did. 2 weeks ago, all of our reservations were for 7 and we ate (table service - all seated together) at:
Chef Mickey
Coral Reef
Cinderella's Royal Table
1900 Park Fare
50s Prime Time Cafe
Tusker House
For all but Coral Reef we were seated at the same table - at Coral reef, we were in a curved booth with 2 tables, so it was essentially the "same", the two tables just were not pushed together. While we had 2 tables, we certainly did not feel separated, and no other guests we're around us...the booth was shaped like a semi circle, and 3 of us sat around one, the remaining 4 at the other.
Have a great time!