Received 3 backlinks as a review copy of the service.
The content was readable, properly structured, and each post had a different image. The links were placed naturally within the first or second paragraph.
The sites use established TLDs, which explains the high DA, but the PA was also strong on the pages where my links were placed. Overall, the metrics looked good and it seems some effort has gone into building these properties.
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The site templates are somewhat similar, so I'd personally add more variety to make them look more distinct. That said, for backlink diversification, I think they work well.
A big plus is that all three posts are already indexed in Google.
Good luck with sales, @JohnRank.