You'd want to run this operation from the rooftop of a building, not the ground. You'd also want to augment the quads so that when they reach a low battery thr

You'd want to run this operation from the rooftop of a building, not the ground. You'd also want to augment the quads so that when they reach a low battery threshold, they return to the rooftop automatically for new batteries or a new ad. To ensure they don't collide, you could use simple IR transceivers on the sides of the quads to allow them to maintain optimal distance at all times. Finally, if you want to get REALLY creative, you could adapt gyros to the quads to allow them to stay perfectly still, even in high winds. Rain would now be your biggest foe.