Many studios use a clear glass, polycarbonate, or plexiglas tabletop and then use translucent material to make a "sweep". The translucent material could vary depending on the size of your subject. With small macro work, Rosco or Lee gels could work well (not sure what brands or sizes are available in NL), and give you a wide choice of diffusion properties and optical density at very reasonable cost.

The "sweep" is made by resting one end of the background material on the tabletop and clipping the other end to a crossbar above the table.