One particle with 2 rates, one left one right

Hi everyone,

I want that If an object falls down to the ground it should only play one particle with 2 rate(one left one right). Like this pic:

I have already created the particle effect and optimized it but it’s not perfect. The 2 particles are played randomly. Here is the video how it’s look now: - YouTube

Particle System Properties:

Last but not least, is there a way to disable the particle if they collides with the ground?

I hope someone can help me. Thank you so much.

Duplicate the Particle system and place as child with velocity over lifetime with +ve value