My tanks are on a hill in a hull-down position:
The enemy opens fire with normal shooting, they get the -1 to hit penalty, everything ok.
The enemy shoots with a template weapon, direct fire. Rules wise, they get the penalty too, since they are partialy obscured.
But the question is: would they get the -1 to hit penalty firing a template weapon indirectly????, the tanks are not IN cover terrain like forests or ruins, just behind the crest of a hill, and since indirect fire does not require LoS...