Algorithus

This plugin allows you to easily control whether search engines are disallowed from accessing the root directory of your WordPress site by modifying the robots.txt file. You can enable or disable this functionality from the “Reading” settings page.

AWP Disallow Root Control

Disallow access to the root directory via robots.txt with an option to enable or disable.

adenergizer

Adenergizer helps you serve ads.txt and app-ads.txt for your WordPress website without much doing. 
It helps you create and manage ads.txt, app-ads.txt from within WordPress admin area. 
By installing and activating this plugin you’re ready to serve these files without much effort, 
as no need to manually create ads.txt and app-ads.txt on your server. Adenerngizer automatically 
serves these files for you and you can control what content is served.
With Adenergizer you can specify clear instructions to web crawlers which part of your website they are allowed to 
access and can improve transparency for your buyers. By serving ads.txt and app-ads.txt you can make sure that your 
content and products are known to search engines, so the user can easily find them. It also help protecting your data 
and content which is not meant to be visited by crawlers.

Ads.txt and App-Ads.txt – AdEnergizer

Create and edit ads.txt, app-ads.txt files from the convenience of admin dashboard.

AWP Disallow Root Control vs Ads.txt and App-Ads.txt – AdEnergizer