The main sensors, used to monitor the energy consumption, should be placed on the main service leads, with the Sense logo facing towards the power source. To make it easier for the monitor to match up the polarity, phase, and current, both sensors should be facing in the same direction. Exceptions can be made in the event that you are limited to space within the panel.
The solar sensors should be placed directly onto each leg of the incoming solar feed (A/C side only). They must be matching in the direction so that the polarities match up during the in-app solar setup. As a reference, the solar sticker should be facing toward the breaker, and the Sense logo should be facing towards the solar source.