Unblockr has released an excellent app for android devices including shield/firestick/tv/phones.
This app, along with the VPN app is now on Amazon store and google playstore. Search for Unblockr
All that is needed is an Unblockr DNS subscription and the app.
VPN users have DNS included and can also use the app.
Merely install your api key (found in your Unblockr profile) and select the country that is closest to your location.
The api key is case sensitive and linked to your account..
With this app you no longer need to configure your router or device.
The app has to be installed on each device you want protected by DNS.
With this app you no longer need the kodi diagnostic addon as the app updates our servers.