Data Mining Expert - Prevent IP Blacklist Whilst Scraping

We are scraping various data and want to prevent IP blocking, We require someone who has knowledge in this field that can prevent this from happing, Whether it being installing a rotating proxy list or other factors you must have knowledge of how to do this. I then need you to show me a demo of how it all works for example where to add free ips etc... so I can pass it on to our client. Thanks