To find the waterfall option for work emails:
1. Click "Add enrichment" button in your table
2. Search for "Work Email" in the list of available enrichments
3. Select the waterfall option - you'll see a pre-arranged order of email providers optimized for coverage
The waterfall enrichment allows you to search across multiple email providers (Prospeo, DropContact, Hunter, Apollo, etc.) to maximize your email coverage while minimizing costs.