For drywall installations, you must mount into wall studs (typically 16 inches apart). Never mount a TV directly into drywall ...

Fixed mounts give your TV a clean gallery-like look by keeping it snug against the wall ... This list has everything you need ...

And no, it has not moved or sagged away from the wall after the first 10 days. Nor do I think it will. Before I hung the TV, I pulled hard down on the mounts to see if there was any give.