This is a large standing desk that can be placed on your current desk. It has enough space for two monitors. Easy to adjust in height with the gas spring system.
Previous Amazon description:
TaoTronics Height Adjustable Standing Desk, 36" Stand up Desk with 12 Height Levels, Sit to Stand Desk with Gas Spring Hovering, Desk Riser Fits Dual Monitors, Grey (TT-SD002)