If they get close to the border - they will be in dispersed military formations - so much harder for a single rocket or missile to take out 2-3 of them with one shot. If you can go down as far as Tel Aviv and the West Bank, then you should be lobbing rockets at these locations.
Let us wait a little while as it looks like the entity is still building up its armour in this location. Hezbollah may wait for more to come into place.
They may be massing but will probably still be many 10s of metres apart from one set of vehicles to another and so not that easy to take out with rockets with CEP in the 100s of metres.