Print two times and assemble it to a board with depth 146,5 mm and height 18 mm, length is variable, e.g. 500 mm. On the lower side there are 4 little holes for glue tiny rubber feets in it.

You need some tiny spax screws for fixing the board to the 3D-printed parts.

I designed the stand, using a rest of a bigger board, so there are funny dimensions.