Plugin may require some small setup action in order to compile in your device with no issue. If plugin isn’t installed the window of settings will be opened automatically in the Inspector view. If for some reason it wasn’t opened after you imported the plugin, go to: Window → Stans' Assets -> Google Mobile Ad → Edit Settings
And just press the Install Plugin button. If the installation is completed successfully you will see the message as on the picture below.
Plugin should play well with all other IOS, WP8 and Android plugins. If you found any conflicts feel free to contact support team.