You could try, but I am not sure if that will help. alternatively you can just try and scrape all the results from scrapebox and load the urls and then scrape the mails. At least to get going
The issue may be that your ips are getting blocked. That seems odd after only 15 results though.
But it can't hurt to try it with your own ip, how does that work?
Also you can whitelist the email scraper plugin in any security software as it could just be that its being blocked after so many connections.