1. On units that can mount vehicular stealth armor, you can mount it with ASRCS or S-ASRCS, but because stealth armor imposes a hostile ECM effect on the unit mounting it, this is a very ill-advised decision with ASRCS.
2. On units that can carry targeting computers, they are compatible with either ASRCS or S-ASRCS, and the unit gains the -1 bonus to-hit. Drones do not have a step in their decision tree that allows them to decide to aim for a location.