Purchase beforehand
Ability to cover broken out windows when the rocks or high speed projectiles fly. Tarp and tape, plywood.
Several fire extinguishers.
Food water for a week. First aid kit/extensive
Hand gun. Shot gun. Rifle. Ammo. And the will/skill to fire back.
Video security cameras w dvr. + battery back up. FRS radios w/ extra batteries.
Last but not least have a back up plan for escape.
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Most mob violence ends quickly when several in the mob drop to the ground in a bloody mess. Watch any YT video with riots/mobs. As soon as gunshots are heard watch them scream and scramble like roaches.
Then be prepared for a more coordinated mob action soon after. They will attempt to get revenge on those that greased their fellow rioters.
To stop a mob, shoot the closest three in the groin area. As they writhe on the ground screaming in agony their fellow rodents will lose the will to continue. some will drop in place ... use head shot on those. some will run for cover, pick off the slow runners then refresh the magazine well.