Probes need to be placed where they can get adequate air mixture, such as more than 3 feet away from the evaporator. The return grill in the occupied space can be used for the return probe. The supply probe can be placed in the 1st available register off the plenum. Probes should not be placed too close to the evaporator, since this will cause a false low air flow indication.
Sorry we haven’t responded sooner! At this time we don’t have the ability to map suction line and liquid line temperatures from the 912 M or any of the other probes. This functionality is defiantly on our road map. We intend to make significant APP improvements over this summer.