I routinely ignore them when they spawn and rarely ever see more than 1 per wave and still typicaly get 800-1000 per 10 waves. Once spawned, don’t run over to it but rather continue to focus on killing hordes as this spawns other aether events. This strategy works even better once you’ve chosen +50% aether events boon.
Juat don’t tell Blizz about the strategy because instead of fixing the balance, ancestral and max affix drop rates, they’ll just put out a patch making spires more annoying.