US Car Tool Torque Boxes and Sub Frame Connectors Install

Looking to see if anyone has experience installing the US Car Tool torque boxes and subframe connectors. My questions is, do you stitch weld the subframe connectors to the floor pan, or completely weld them? I think the torque boxes would get weld completely, but the subframe connectors would create a lot of heat to weld solid to the floor board. If anyone has experience with the install and or pictures, I would appreciate the insight.