Vandalism protection for porta potties on isolated November 2026 sites

We're breaking ground on a remote commercial site in November 2026. It's a 12-week project with 50 workers, no food or alcohol, just a standard portable toilet cluster and an ADA-compliant unit on gravel ground. Truck access is fine for delivery and weekly service, but the site is isolated after hours. Last job, vandals tipped a unit and broke the door hinge. What are the most effective security measures for long-term sites? Should I consider a locked enclosure or specific placement strategies?