Never used IPs for off-page. Should I?

Using US IPs can help a bit with geo relevance, especially if your target audience is in the US, but it’s not a major ranking factor. What matters more is getting links from US based or US relevant websites. The IP location can slightly support the signal, but the link’s quality and relevance matter far more.

The question of using IPs for off-page activities is highly relevant, especially for scaling link acquisition efforts.

Using diverse IPs (like residential or mobile proxies) is crucial if you are managing or building any kind of large-scale link network or running aggressive automation tools.