[PlasmaKrab]

This is broadly what we have discussed above in this thread.

Many older warheads, plus probably some tandem HEATs, will have a fine enough fuze well that can slip between two bars, which will lead the warhead to be crushed against the bars without detonating.

About standoff, the question is: from what weapon up can the penetrator be considered untouched by one foot thick of cold air? That is, neglecting the incidence angle. Air won't spend and slow the penetrator jet down as steel would, but the metal will cool down anywauy. If the amount of energy spent is significant or not I must still calculate...

Additionally the bars in these systems seem to be thick enough, in the penetration direction, to deflect and maybe disrupt a penetrator coming at an angle.

Standoff plus a thin steel of hardened sheet seem effective enough against RPGs, since Tsahal has fielded a different kind of plated perforated spaced armor on their M113 "Zelda".