The amount of data you can gather using the Clay Chrome extension depends on how much you scroll through the webpage. The more you scroll, the more entries you can load and scrape. There isn't a fixed row limit - the extension can capture all the data that's visible on the page after scrolling.
The Clay Chrome extension automatically detects and scrapes items that appear as a list on your webpage. You'll need to manually scroll through the page to load all the content you want to scrape - there isn't an auto-scroll feature built in.
As for Zenrows, it's primarily focused on bypassing anti-scraping measures and handling JavaScript rendering, but doesn't specifically include an auto-scroll feature. It's designed to scrape the content that's available on the page at the time of the request.