It's not a good idea to post the same content to all of the domains.
If you are using those websites as a PBN, you should only produce unique content for each website. Each site should be set up properly, like a normal website. To manage such a number of websites, you need to have a team working full time on it because, in real life, it's a lot more difficult than you might imagine. Even using a management tool would be very time consuming to do on your own.
Instead, what you could do is to build a significantly smaller number of websites on much more powerful domains. It would be a lot cheaper, faster, and more efficient.