Marat Nepomnyashy

Overview:
At the time of this writing, the latest version of WordPress, version 4.7, 
 has functionality to discourage search engines from indexing the whole site, 
 but not functionality to discourage search engines from indexing only certain 
 specific pages and posts of the site.
Robots Meta Whiz is a WordPress plugin that allows site administrators to 
 deploy custom meta robots tags to discourage search engines from indexing, 
 following links from, caching, indexing images from, and / or have 
 additional custom restrictions on only for certain specifically-designated 
 pages and posts.
It is an easy way to discourage search engines from indexing only specific 
 pages / posts.
This only applies to search engine robots, and will not effect the site’s 
 local search functionality.
Technical summary:
Plugin works by hooking-in special logic into the action ‘wp_head’ to inject 
 the tag <code><meta name='robots' content='...'></code> with restriction directives for 
 the specified pages and posts.
Official project URLs:
https://wordpress.org/plugins/robotswhiz 
 https://github.com/maratbn/RobotsWhiz

Robots Meta Whiz

Easy way to discourage search engines from indexing only specific pages / posts with custom meta tags.

naimgr83

Bots and web crawlers coming to your site check the content of the full user agent string, and those that are not on the whitelist will be blocked. 
AI crawlers are also blocked.
In addition, you can manually blacklist the IP address. If you enable the automatic IP blocking option, IP addresses that make more than 5 requests in 1 minute will be blocked for 240 minutes (4 hours) by default. 
You can change these values here.
<h3>Blocked bots include:</h3>
<ul>
<li>GPTBot</li>
<li>ClaudeBot</li>
<li>Amazonbot</li>
<li>SemrushBot</li>
<li>MJ12bot</li>
<li>and more bots…</li>
</ul>

crawler-hunter

It is a simple but effective plugin. Stops spam bots by checking browser content. You can also add an ip address to the blacklist.

Robots Meta Whiz vs crawler-hunter