I'm guessing that you've figured this out. We just implemented as well and my colleague created a SmartCampaign that fires anytime a lead is created. We integrate with Salesforce so I have condition checking to make sure the lead was created by Marketo. I don't want RingLead to dedupe leads created by Salesforce.
I'm wondering how other people have implemented. I'm not getting much help from RingLead support.