If you have an iOS device, there isn’t much required to use the beta app.
Click the link in the post below from your iPhone to download the app in TestFlight, the iOS platform for beta apps.
Note that since it’s a beta app, unexpected behavior, bugs or even app crashes can happen.
So if you’re seeing better performance with your geofence using the most recent public iOS app, you might be content to wait til version 2 of the app comes out of beta.