Google Ad Manager in Connected TV Apps

We currently have ROKU TV, Apple TV, Amazon Fire TV and Android TV apps that are already built but we would like to add Client-Side Google IMA Ad Insertion. We currently stream via Nimble. We need to implement client-side ad monetization using the Google IMA SDK, along with updating the splash screens while we are working on the apps. This is strait forward and relatively simple job but I wanted to be as detailed as possible on whets needed... *Pre-Roll: Integrate Google IMA client-side pre-roll ads when the user launches the app. The ad request must be capped at a maximum duration of 15 seconds. *Mid-Roll/Commercial Break Architecture (SCTE-35): Implement client-side ad insertion driven by embedded SCTE-35 triggers. The player must smoothly transition from the live feed to a 2-minute Google ad container when a tag is detected. *Transition Optimization (Background Pre-Fetch): To eliminate loading lag/black screens coming out of commercial breaks, you must write a background pre-fetch routine. Roughly 2 seconds before the ad pod finishes, the live player must initialize the live stream at the live edge (offset -1) in the background, ensuring a seamless snap back to our studio feed. *Error & Empty Pod Handling: Implement strict error-catching. If Google Ad Manager returns an empty response (no ads available) or times out, the app must immediately kill the ad container and instantly fall back to the live stream without freezing. *UI Update (Splash Screen): Replace our current launch splash screens.