Modern households have 5-10 connected devices spanning multiple operating systems. Unified suites offer significant advantages: single subscription, centralized dashboard, cross-device threat intelligence, synchronized policies, and password manager sync. Norton 360 Deluxe across Windows, macOS, iPhone, and Samsung provided seamless protection with 847 passwords synced. On iOS, SMS filtering is limited by Apple’s restrictions — true for all security apps. Best-of-breed approach may provide slightly better per-platform optimization but requires multiple subscriptions. Our guide includes device-by-device recommendations and step-by-step setup instructions.