How to Change Trail Render Position in 3D?

I have a 3d ball in my scene with trail renderer component and when i play my scene trail render position is in middle of ball, but i want to move trail render position to the bottom of ball. so, how do i change trail position?

Add an empty game object as a child of the ball , move it into the correct position at the bottom of the ball and assign the trail renderer to the empty game object