Use the PSW 222's for their firepower if you are really concerned about HIP OBA Observers, Mortar spotters, and MG nests on the rooftops. They can go through wire, gullies, hedges, and entrenchments to strip a lot of infantry concealment (presummably ahead of an infantry attack). In these cases keep them in motion, don't bunch them up, and away from known AT guns that are not otherwise occupied. VBM Sleaze vs. poorly placed or poorly supported MG nests in buildings or pillboxes.
They do have potentially endless mobile (dispersed) smoke discharger capability, which the halftracks lack. Not sure if vehicle smoke is used as much as it could be.
As with any blitzkrieg weapon/strategy, these have to wait for the appearance of a breakthrough. This blitzkreig will be more of a low budget version. Mostly a mid-game weapon, I think.
Otherwise, keep them offboard until you need them.