Quad Monitor Desk Mount – VIVO - desk solutions, screen mounting, and more
Amazon.com: Stand Steady Clamp-On 4 Monitor Mount Desk Stand | Height Adjustable Quad Monitor Stand with Full Articulation VESA Mounts | Fits Most LCD/LED Monitors 13-32 Inches | Easy Set-Up Four Monitor
HP E27q G5 27" Quad HD monitor - e-point
Zenview Quad 27Q - Four Monitor 27″ IPS | Digital Tigers