If you haven't seen one, the VariDesk is what's called a standing desk converter. It sits on top of a desk and can be raised and lowered with a lever. Room for a keyboard, mouse, and two monitors. I can send some images. It has had very light use and is in great shape. They're around $340.00 new. I'm selling for $150. We are outside Winthrop. Here's a link that shows what it looks like:
https://www.vari.com/varidesk-converters/