You could create 2 differente Flex schedules and put specific days on which they can run, that way you ensure they both done run on the same day. If you had 10 zones for example, maybe put 5 zones on Flex schedule 1, and 5 zones on flex schedule 2.
You need to water deep to encourage deeper root growth. However, if you have very shallow roots right now, you need to start out small… I’m not very familiar with fescue, but perhaps put your zone setting to 4". Over time (a month??) increase your root depth to 5… and so on.