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2 because it's easiest to remember. In 2019 exact-match domains have less impact on SEO, it's more about 10x content and demonstrating a solid value proposition (watch up to the point where issue #1 is fully outlined). SEO is a pretty vast field in modern times. Coding tweaks and URL slugs are still somewhat important, but they provide slight, slight bonuses to your core value proposition (the value-add of your site, to the internet). I don't think engagementrings.com is too bad, but without a solid 'idea' and value-prop behind it, the URL won't magically make it rank alone

Hi, I agree with Bagia. It must be a natural link, mixing the anchor text. And not everyone should go to the homepage. Regards

The truth is that no one knows, but greedy people often do get hit and stung by Google I certainly wouldn't exceed 20%. To be honest, I personally wouldn't build ANY EMA (exact-match anchor) links at all. I'd just build 'good links' and then let my own site's internal link structure, re-distribute the new PageRank as appropriate I'd only use brand or part-brand part-product links. I wouldn't use exact match keyword links (ever)

This. Fiverr is spam-ville. All the job requests are active requests for spam, and most of the people who take the jobs are con-artists of one form or another. Darin is right OP, re-think your approach