Hello,
I am a PHP developer and a scraping expert.
I have done this before, and for the no blocking part, may i know who's app that you're scraping, if its yours, you don't have to worry if not, i can implement IP changer, but its up to the frequency of scrape which will tell how much IPs you'll need.
The final price may change, and any change in the requirements will result in extension.
Feel free to contact.
Thanks
Meeshal k