IMO, you shouldn't just use one strategy for your backlink profile. For example, don't just buy blog posts - or don't just build a private PBN. You need it all - forum posts, blog posts, sitewide Wordpress sidebar links with wonky anchor text, header links, footer links, social media links.. on and on and on we go.
Just like with anything in business, if there's a single point of failure, you're more likely to have a bad time.
Whois / IP and all that is mostly just hysteria from "SEO gurus".
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