Firebase staged feature roll out for Apps

Has anyone got any experience testing percentage roll out of features that are toggled in their testing environment. (Firebase Remote config and percentages.)

We do App testing, and a new feature is on a staged roll out, we can start to display the feature from an already deployed build to a small number of customers. iOS and Android.

To test this, we are thinking we can have a few devices and simulators running, set the percentage to 25% and 50% and see roughly how many devices show the feature. Hopefully not all of them, and testing 0% and 100% too.

I found this blog from 2016 explaining how to develop this feature.