Get ScrapeBox -- http://www.scrapebox.com
The new google mobile site tester addon replaces the old mobile site tester addon. The steps needed to set it up are:
Steps:
Register - Google API Console
Create A Project
Enable PageSpeed Insights API
and
Google Search Console API
Add API To Project
Paste API in Scrapebox, making sure there are no preceeding or trailing spaces
With this addon you can bulk check sites for whether or not they are mobile site compatible or not. You do need to sign up for a free google pagespeed insights api and stay within the speed and query limitation that google sets.