Another option is to bolt through a hole from under the desktop for a clean and secure attachment.
This flat‑clamp monitor mount is designed to keep a cleaner low‑profile look behind and under desks. The mount itself sits on top of a desk for stability and provides two mounting options for secure attachment. Workstream by Monoprice Dual Monitor Low Profile Flat-Clamp Mount for Screens Up to 27in Features: Clean looking, low‑profile monitor mounting option Provides height‑adjustable desks extra space for free movement Two mounting options for easy installation Adjustable for comfort and optimal viewing angles Safe and secure Supports up to 27" displays Supports displays weighing up to 17. each Support Files: User's Manual (Dec 28, 2018) Dimensions Diagram (Jan 7, 2019) Monoprice™, Workstream™, the Workstream logo, and all Monoprice logos are trademarks of Monoprice Inc.