How to properly run a stream with transcoding via FFmpeg to 3 outputs?

Question

fmpeg

How to properly run a stream with transcoding via FFmpeg to 3 outputs?
Here is an example diagram:

ffmpeg -i video.mp4 -c:v libx264 -s 500x300 -r 25 -vb 300k -profile:v high -preset:v slow -c:a libfdk_aac  -b:a 22k -ac 2 -ar 22050 -f flv \
rtmp://output1 \
rtmp://output2 \
rtmp://output3

That is, the transcoding parameters for all 3 streams are the same, you need to run one process.
How to do it right?