The solar module should be oriented to the south. In Central Europe, the recommended tilt angle is approx. 30° to 40°. A flatter tilt angle increases the energy yield in summer, a steeper tilt angle increases the energy yield in winter. Make sure that the solar module is not shaded at any time of the day or year, otherwise you will have serious performance losses, even with minor shading. Pay attention to soiling of the solar modules (pollen dust, leaves, soot, dust...), it has the same effect as shading the solar modules, regular checks and cleaning are recommended.
In the following graph you can see in percent how effective the placement of the solar product is in each case: