They wouldn’t work against a cruise missile.
In fact, there are really no great defensive measures to take against a low flying cruise missile. Yet.
Fast aircraft with look-down shoot-down capability is one option, but it has to be in the air where the missiles are, at the time when the missiles are there...
“ They wouldn’t work against a cruise missile.”
You misunderstand. Iran was of the opinion that their “underground missile from the depths of the earth” was something new.
During the Cold War the US had nuclear tipped Nike missile sites, one of which is very close to where I live. They used subterranean missile silos, hidden on farms in rural areas.
Any AA missile.