block seo crawlers

If anyone can suggest something to make this it will be appreciated. I know I can use a robots.txt file but not all bots respect this, I am sure 100% of this. There's documentation by Google to prevent Google bots to access your website, but I am also 100% sure that their documentation is not...

a small plugin (2.40kb) that writes code to .htaccess to block seo crawlers. user agents that plugin blocks: rogerbot - opensiteexplorer Dotnetdotcom.org - Moz mj12bot - Majestic ahrefsbot - ahrefs exabot gigabot sitebot dot bot virus total...