> I personally register my devices as test Devices in Admob Console. And not use any "Test mode" or test ads on the actual plugin.
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> Then I try the app in Android Studio (this will always be classified as test device), or install them on my physical device (which is registered as test device in Admob console).
This is the perfect solution. Otherwise you will have to unnecessarily compile your app 2 times (one for test & another for production)
Also subtract the headache of accidentally trying live ads on your mobile. Admob takes it very seriously
Nothing wrong or time consuming about exporting a test APK on the mobile device, you should be doing this anyway to test the game without ads.