In my experience, there's only one rule to surviving an acquisition: find political cover immediately. Upon acquisition, you and your team are an alien entity embedded in BigCo's immune system of political networks and operating rules. They don't know what to do with you, you are a threat to established patterns, and you will lose to the experienced players. So unless you have C-suite cover and a title to match it, you need to find existing, powerful entities with complementary capabilities and a need for what you do. If you make yourself useful as you are, then your patrons have an incentive to not meddle too much with your team. But if you don't have anyone protecting you out of self-interest, eventually you and your people are going to be absorbed, rebuilt and rebranded.

I mean, that'll happen anyway, but at least you have the option of staving it off long enough to get your team safely out of there.