Hi Alan,
Greetings from Syncfusion. Currently, you can move the trackball tooltip at the bottom, center, and top of the chart area. The tooltip will always show to the right side of the track line and the trackball tooltip can't be moved at the top center on the track line. If there is no space in right, the tooltip will move to left side of track line, this is default behavior trackball tooltip.
Regards,
Yuvaraj.