ViewSonic X100-4K Upside-Down Stand

ViewSonix X100-4k projector / beamer stand for placing the device upside-down in/on a high shelf with optional height adjustment screws.

Since the X100-4k only has +65% vertical lens shift range but -0% picture can only be shifted in one vertical direction.
For my setup I need shifting it in the opposite direction thus requiring to place the device upside-down (like mounted at the ceiling). In my setup I want to place it in an existing high shelf, so I need a stand for it with the possibility to adjust the stand. This is my solution...

For optional height adjustments four M6 bolts can be inserted from below. Corresponding M6 nuts are inserted from one side. The bolt heads can be of any form you need, eg. rubber/plastic coated knobs/wheels. In my case I need a solution for a wireframe shelf board. See photos of my bolt / nuts / washer arrangement. I used M6 x 60mm bolts. The result is a height variation of about 20mm.

The stands have measurements of 420 x 15 x 55 mm.