Box-per-tenant
Running each customer's site on its own isolated virtual machine (its own box) instead of sharing one server. No noisy neighbors, no shared blast radius.
On shared hosting, one busy or compromised site can degrade every other site on the machine. Box-per-tenant gives each site its own dedicated resources, its own backups, and its own clean failure boundary. Moving, restoring, or offboarding a site becomes a contained operation rather than surgery on a shared database.