It's also common to have multiple type of plants in one zones. Usually, it's recommended to use the plant that needs most of waters. For example, if you have shrub, trees and flowers in one zone , it's better to use "flower". This is because tree can survive with more water, but your flower could die without enough water. One exception is Xeriscape, which could die with more than enough water.
You can assign your sensor to your zones to monitor the moisture level of your zones and set threshold to skip watering.
For more information about Netro smart watering, here is an article about Netro three watering modes which might be helpful. https://netrohome.com/forum/posts/111