Those domain stats are very average at best. Regardless of that, you need to ensure the old sites were on topic. No point worrying about metrics if the old sites were off topic (check Wayback). And what about the topical relevance of the inbound links? A domain's old site may appear to be about cars for example, but all of it's inbound links could still be categorized as gambling for example.
Also think quality rather than quantity, rather than buy all of those separate domains at $30-50 each, you'd be better off getting one high quality domain at $250-300 with much better metrics which also had an old on-topic site behind it.
Low quality PBN's aren't working anywhere near as well as they used to. For $300 you be better off getting a good editorial link via guest post or something. That way your link is clearly on a site that you don't own, and you could easily juice up that link by sending some links to it or even a sneaky 301. That way your link is now on a DA60+ site and after the juicer tier two links kick in you'll easily drive that page authority up to 30+ as well. I'd rather that single link than 5 links from low quality PBN's.