>>8037595 (PB)
It's cheaper to rent and 'dress' a practical location than to build a whole set for a single commercial or a music video. Big budget TV and movies will build sets on soundstage for convenience sake
Any one producing child porn or snuff flicks bestiality other illegal content will be exceptionally careful the location be non identifiable. a specialist company like the one you found, could plausibly be used to source such an ND place