Is SecuPress multisite compatible?

Yes SecuPress is multisite compatible.

If you have a multisite, you have to purchase a license for the number of sites in your installation.
Example: A 10 sites license allows you to protect a multisite environment with 4 sites, and 6 independent sites.
Please note:
  • SecuPress must be installed by the Super Admin on the main site. After that, make it available on the site network.
  • It is not possible to activate SecuPress on only one of the sites of the multisite.