Unlike Abaqus, CalculiX doesn’t have the random vibration analysis procedure. However, there were some attempts to perform equivalent analyses using available linear dynamics procedures (namely modal dynamics): Dynamic simulation of the PCB
Some time ago I used the same example as shown in this video but with beam elements. It’s from Abaqus documentation (Random response of a cantilever subjected to base motion). I compared it with modal dynamics in Abaqus but you can try the same in PrePoMax. I just used different signals - white noise in modal dynamics and its PSD in random response. Those signals were used to define acceleration base motion. Proper incrementation was needed in modal dynamics analysis. The stress results were comparable after multiplying RMS results from random response by 3 (assuming 3σ).