Select Network section, uncheck Use Random Ports under Incoming Ports and set both input fields to 58112.
Click the Plugins section
enable the labels plugin.
enable and the Extractor plugin.
In order for Sonarr or Radarr to import media packaged within .rar files, they will have to be extracted.
After clicking "Apply", select the Extractor plugin on the left.
Make sure the directory points to the completed folder within your Deluge data directory. /mnt/unionfs/downloads/torrents/deluge/completed
Also, make sure that the Create torrent name sub-folder setting is checked.
To add Deluge as a download client in Sonarr/Radarr use the following settings. Both are able to remove completed torrents after they have finished seeding.