You will need a license for each website that you wish to protect.In this case, if you want to protect all 5 websites, you will need a 5 scan target license.
Featured Article — Acunetix v10.5 adds support for Joomla! Drupal and CVSS3.0
A new version of Acunetix Web Vulnerability Scanners v10.5 has been released. The new version tests for Joomla! and Drupal vulnerabilities, supports CVSS 3.0 and includes other improvements/bug fixes. Joomla! and Drupal Support Acunetix v10.5 now reports vulnerabilities in popular content management systems Joomla! and Drupal. The new proprietary database includes close to 300 Joomla! and Drupal […]