I'm pretty sure the HIMARS has satellite guidance. Granted that that isn't perfectly real-time, it's pretty useful, I'd think. Drones could have a role as well.
Having said that, I think the Ukrainians using the HIMARS/MLRS against supply facilities, generally immobile, is the smart money, because without fuel, you ain't moving, and without ammo, you ain't shooting.
Targeting supply depots will, aside from destroying resources, force the Russians to keep their depots further back, thus increasing the resource expenditure and attack-exposure of the elements bringing the supplies forward.