Bot networks really don't strike me as effective or efficient in manipulating social media.
If I were running the show I believe it's more effective to let specific people rise to the top and then provide a "support fund" to augment their activities. The goal would be to let the best posters rise to the top and then manage their transition into doing that activity fulltime. You're going to get way more out of real authentic propagandists than some bot network with limited impact.
A "media support team" would be set up that goes about identifying the best of the best and figuring out how to transition them into the role fulltime in a way that also enables them to disconnect from any funding the support team provides too. By the time the person is identified as someone that might have had their career helped along by a state actor the state will be fully disconnected and any trail would be dead.