Upgrading domain with wordpress...!!!

I have 35 different domains i will put online these couple months and intend to interlink them together since they are all the same niche. I was wondering whats the best way to go about it.. Hosting has to be completely different and possibly different companies. Anyone else tried blog farming and whats the Google anonymity rate over time

Saw wordpress you pay 18$ a year to upgrade a blog.wordpress.org to domain.com but i am not sure if they give you a different IP.. Not sure if it affects your sites since they will all be poionting to the same wordpress name servers

Any thoughts

Site.Wordpress.org domains are pretty hard to rank compared to a good aged .com domain.

If websites are pointing to the same wordpress name servers then Google will easily identify them, so there will be no big SEO value at the end, but it'll be better if you can diversify them using other networks and sources such as blogger, weebly, Wix, etc.

2nd on blogger, weebly, etc approach