Best Practices for Tracking Campaigns

I’m trying to figure out the best way to pass the campaign name from Unbounce to a lead generated in Salesforce. We use MailChimp to create campaigns.

So far I’m thinking that I have to create a separate landing page for every campaign and create a custom hidden field that holds the campaign name and syncs to a field in Salesforce. Is this the right approach? Looking for recommendations!

Thanks