You will definitely be able to watch the fireworks and then go to your ADR. HEA is 18 mins in length which gives you 17 mins to get to your ADR which should be lots of time from anywhere in the hub/Fantasyland/Main Street area. It will be busy but you'll be fine.
CRT really doesn’t have a view of the fireworks, so guests don’t book intending to linger over their meals and watch from there. IOW, the fireworks schedule doesn’t affect seating there very much.