A convenient way to hide your WordPress from view is through code. Web crawlers will not find any trace of WordPress on your site. Over 99.99% of hack sites are targeted attacks against certain plugins and theme vulnerabilities. Since WordPress plugins and themes are no longer found, no hack occurs even if the site uses vulnerable code.
Info: https://www.wp-hide.com/
No negative impact on SEO at all! When used correctly, specific aspects of SEO can be improved. The plugin not only allows you to change the default URLs of your WordPress, but also hides/locks the default settings!