Ok, now it is clear.
I just updated the module and you should now be able to use the key “alignment” in your config.
username: 'Last.fm username',
apikey: 'Last.fm api key',
//time interval to search for new song (every 15 seconds)
updateInterval: 15 * 1000,
//how often should we try to retrieve a song if not listening
//time interval to search for new song if the 5 times not listening is received.
//set this to the same number as updateInterval to ignore this option
//Determines the position of the meta text. Possible values: top, bottom, left, right
This is not tested since I do not have a mirror atm but it should work