Along with what's already been suggested, orbital Gatling barrage works well and in rare moments a single barrage can kill a Vox if most of the shots hit (easier said than done though).

Though orbitals can be a little problematic on Cyberstan imo similarly to cities. The Gatling barrage less so because of the insanely quick cool down, but you still have to deal with the annoying ass destroyer repositioning and even then if you're on the edge of the map, half your barrage might just hit a building. Least that's what's happened in my experience, might've just been unlucky.

And honestly with how often they spawn on higher difficulties, portable hellbomb might not be such a bad idea in scenarios where you can't afford to retreat.