Shortlist for manned guarding & reception—who’s reliable?

We’re evaluating a security company in Dubai (https://psm-uae.com/) for corporate reception, patrols, and events. Priorities: SIRA-licensed staff, good English, strong incident reporting, and flexible surge coverage during conferences. Any first-hand feedback on onboarding quality, uniforms/etiquette, and how fast they backfill sick calls on weekends?