unless you want them to revolt... lol@CenturionJixrai asked this once... you can find some of their answer enlightening here at https://forums.sinsofasolarempire.com/309605
Actually, I am almost positive that the Deliverance Engines will never make a planet revolt. My brother always plays the Advent, and at one time knocked up an enemy planet with 72 (yes, seventy-two) Deliverance Engines, resulting with a culture rate being 3000+, but the planet never rebeled.
On the other hand, however, the Deliverance Engine (unlike the Kostura and Novalith Cannons) are able to target friendly planetoids as well. That said, although the Engines cannot *make* a planet rebel, it can immediately *stop* it from rebelling.