clock buffer in Leonardo Spectrum

Hi, I am designing a decimation filter and use Leonardo Spectrum for synthesis. Leonardo Spectrum give me a report of 500 fanout for my clock. The clock has a frequecy response of 50Mhz and the speed of my clock is only 1.5Mhz. I was told that Leonardo Spectrum has the ability to generate the clock buffer to reduce the load of my clock. I set the limit of my load to be .1 and it gave me a fanout of 1 for my clock. Can I trust Leonardo Spectrum for its clock buffer trere or would it induce the slew and slow rising edge on my clock? If clock buffer from Leonardo Spectrum is not reliable what is the approriate way to manually adding a clock buffer since we don't have the tool to generate the clock tree. Thanks, Eng