If you want to use a left-handed setup, leave the drum sound module (TD-50X) in the same position, but exchange the position of each pad and cymbal (together with its mounting clamp) left for right.
If you do this, some of the cables will not be long enough, so use commercially available extension cables (TRS 1/4” phone - plug, TRS 1/4” phone - socket) to adjust the cable length.