What "proxies for Google" actually means
A proxy for Google routes your request through an intermediary IP so that Google sees the proxy's address and location rather than your own server or office connection. Google ties rate limits, CAPTCHA challenges and the "unusual traffic" interstitial to the requesting IP, and spreading requests across many IPs to stay under those limits works around them rather than respecting them.
The proxy also controls which localised SERP you receive. Google personalises results by the apparent location of the requester, so an IP in Manchester returns different rankings, ads and Map packs than one in Munich. For accurate data collection you need IPs in the exact markets you measure.
Budget Proxies supplies HTTP, HTTPS and SOCKS5 endpoints with username-password or IP-whitelist authentication, so the proxy slots into whatever scraper, browser or rank-tracking stack you already run.