Which CPU Holder Should You Buy? A CPU holder is a desk accessory that secures your computer off the floor and adjusts vertically and horizontally for various computer towers. It provides several mounting options so your computer can be placed under your work surface or to the side of your workstation. To adjust the CPU holder, simply twist and slide the comfort-grip knob to the desired height. There are many great CPU holders available in the market today. But which one should you buy?