Using them is very simple: they are meant to shoot from range. Their ZZ-rifles are accurate and reliable even at long range. Once in position the kaptars can easily take care of any target bold enough to step within range and karma knows their weapons can shoot far.
Their “natural” targets, when they have no special weapon, are infantry units: Their ZZ-rifles are efficient against any kind of infantry, including battlesuits. In contact, their power grips can take care of any opponent including armored fighting vehicles.