In our smart campaign, we used the "Fills Out LinkedIn Lead Gen Form" trigger with constraints of Lead Gen Form Name and Lead Gen Account Name (we have multiple LinkedIn accounts). You could also focus in on the specific Campaign Name or Creative Name, but triggering off the Form level made the most sense for us. We have some data management flow steps set up to normalize the data for several of the field values we're capturing. In LinkedIn, you don't have much control over what value is passed for Marketo, so in many cases we have to "fix" the data before syncing the lead to our CRM. We decided not to send an autoresponder/welcome email to our LinkedIn leads, but you could do that as well if it makes sense with your CTA. Then we sync the lead to SFDC. We had challenges getting any values to show up in our Fills Out LinkedIn Lead Gen Form trigger, and spent months going back and forth between Marketo Support and LinkedIn. In the end, there were some inherent integration issues that Marketo and LinkedIn seemed to solve. Hopefully you don't fun into issues with that, but if you do, you may have to reach out to Support. It's also annoying that there wasn't a way to submit a test lead from LinkedIn, so had to carefully monitor everything after we activated it.
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