The method I use to get over 1 million points is to position every single person into a square where each of them are facing 3-6 Cores. Start your disruptor and destroy only the cores that you can see and continue hitting the main core regardless of location.
No extra mods are required if you do this right, I recommend bringing Magazine Extension, Automatic Trigger, or Rubedo-Lined Barrel if you decided to do this event publicly instead of in an pre-made group.
As for getting to the ship in the first place, my method is to go to the left away from cover in the beginning then proceed back to cover to avoid the laser. The reason I go far away from cover in the beginning is because most of the time, there are always Zeppelins in the beginning.