Welcome to the User Community Forum @wnmm60!
I had concerns about power fluctuations and outages as well when I set up my system.
To remedy this, I purchased and installed a highly reputable UPS (uninterrupted power supply). It is an automatic power backup that immediately switches over to battery backup when the power is out.
I plugged this into a plug on a dedicated main breaker so that it wouldn’t be affected if a house breaker tripped.
I have fiber internet, so I plug my Fiber Gateway AP into it along with my WiFi, and HMS Hub. If my power goes out, I still have internet, WiFi, and my HMS remains powered up and on duty connecting to Wyze. Since the sensors are all battery operated and RF, they are not affected by the power outage.
If the power goes out, I get about 8 or 9 hours of battery run time.