What settings are needed to ensure receipt of all types of emergency alert?

I have struggled to find clear information about exactly what settings affect whether various emergency alerts are received or not. Even getting a definitive list of alerts is not as simple as it should be. From what I understand, there are two main types of alert - cell broadcasts and Google crisis alerts (which include earthquake alerts). Cell broadcasts do not require wifi or mobile data, but Google crisis alerts do require either wifi or mobile data. Questions I have are: 1. Does Battery Saver delay or prevent the receipt of either type of alert? 2. Does Do Not Disturb prevent the receipt of either type of alert? 3. Does either type of alert requires location access (GPS) to be enabled at all times (or is wifi sufficient for determining location)? 4. What apps, services etc. are involved in receiving the alerts, what minimum permissions do they need and what settings need to be enabled? I think that for these alerts to be as useful as they can be in saving lives, this information should be absolutely clear and available in one place. In fact, all necessary settings etc. should be configurable from within one app on Android with an option to reset required settings to ensure receipt of all types of emergency alert. In the meantime, I'd appreciate answers to the above questions.