FantasyPro is a third party, fantasy aggregattor. Grant St Fantasy is synced with their system and their rankings will be made available weekly. Depending on how easy it is to connect to their site, positional rankings might be available later in season. 

Keep in mind that while FantasyPros is one of the top fantasty sites, its rankings do not reflect Grant St Fantasy league scoring and doesn't properly weight our tiebreaker rules when determining playoff and championship liklihood.