Unblockr has released an excellent app for android devices including shield/firestick/tv/phones.
All that is needed is an Unblockr vpn subscription and the app.
Merely install your api key and select the country's vpn of your choice.
The api key is case sensitive and linked to your account..
With this app you no longer need openvpn on your device.
The app should be installed on every device you wish to be covered by VPN
Please note.. The Kodi diagnostic addon will NOT work while you are on VPN. It is for DNS only.