Are a bunch of shared proxies good enough for checking SERP and maybe checking for 404 errors. My private proxies (tunnel proxy) get blocked by Google even with a 75 second wait time between uses. I use 15 of them on Traffic Travis and they are blocked on slow machine settings 4-6 jobs at a time, with a 75 second wait time. Does that sound right? What do I need to do to get proxies that work?