Multiple drones. Think cost here. You could have any number of them mission specific- let’s say 20 of them, 1 takes a run and 19 loitering.
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Google says that a SUU-11/A gun pod holds 1,500 rounds and can be set to 2,000-6,000 RPM. By comparison the A-10 carries 1,350 and shoots at 3,900 RPM.
I believe this is the gun pod mentioned:
https://dillonaero.com/products/gun-pod-system/
I watched the video. Unfortunately, they stuffed the truck with what looks like tannerite so it just immediately explodes. I'd like to see what kind of beaten zone this thing is creating.