StarTech.com Sit Stand Dual Monitor Arm, Desk Mount Dual Computer Monitor Adjustable Standing Workstation for up to 24" Displays, VESA Ergonomic Stand Up Desk Converter with Keyboard Tray - Stand Up Office Desk (ARMSTSCP2) mounting kit - for 2 monitors -

Enjoy a more ergonomic workspace with this dual-monitor sit-stand desk mount. This sit-stand dual-monitor arm transforms your desk or tabletop into a highly productive, ergonomic workstation. The monitor arm features a keyboard tray and easy height adjustment that lets you alternate between sitting and standing, without interrupting your workflow.
Adjust your working position, with one smooth motion. Simply lift the work surface up to 17.7" (450 mm), to elevate both your monitor plus your keyboard and mouse. The monitor mount has a separate height adjustment of up to 4.9" (124 mm) along the column. You can also adjust the tension to your own preference for easy height adjustment.
The versatile monitor arm lets you create a productive dual-monitor workstation, supporting two monitors up to 24" (with weight capacity of 17.6 lb./8 kg). Move the swing arm left or right (from -90° to 90°) and lower or raise the arm (from -30° to 65°) to the ideal position. The VESA mount also rotates up to 360° for portrait or landscape orientation.
The monitor arm features a large keyboard tray (17.68 x 8.15"/ 449 x 207 mm) with ample working space. A slide-out tray (8.5 x 8.4" / 217 x 213 mm) holds your mouse, on the left or right. You can tuck the monitor arm away when it's not in use, to free up space. The keyboard tray also folds up to 90°.
The compact sit-stand monitor arm features a grommet assembly and desk-clamp option, to fit easily into your workspace, including space-limited corners.