Tips for Uncovering Total Addressable Market (TAM) in Commercial Cleaning

Hey all! Does anyone have good suggestions on how to best uncovering a TAM? For a project im working on, Im looking to get every single Commercial Cleaning biz (under 50 employees) in US and also a sub-list of accounts with marketing roles. For the sub-list with marketing role, tried out Apollo, Clay, and Zoominfo to identify contacts:

im think the big difference is due to the fact Apollo/Clay doesn't have dedicated filter for "commercial cleaning" while ZI has an built-in industry filter for it. Now for the master list of EVERY possible commercial cleaning biz, does anyone have rec on how to gather this list? Considering to use Serp to mass scrape, but then im wondering what's the point if we don't have owners data anyways? No point on having just the company name lol