If I may make a suggestion, it would be better if the plugin pulled Mono from Sonarr's repository instead of straight from Xamarin, since the Sonarr team checks for stability before changing the version of Mono in their repo.
Is something to take in consideration. The mono repo is also used for the media browser plugin.
@Sergio might have a clue if those repos are usable and also that will not collide with the media browser ones