The cars stopped outside the Kirihara dojo. Sakurai Yaeko's bodyguards stood beside the door respectfully. Nobody was watching this scene as not only did Sakurai Yaeko purchase the entire Kirihara dojo, she also bought the land nearby.
This was also the reason why Lu Shu's information was all found out within the first day. There were no other people nearby the Kirihara dojo.
The Kirihara dojo was a yard. Therefore, if there were tall buildings nearby, people could peek into how the yard looked like using binoculars. Therefore, Sakurai Yaeko demolished all the buildings which were taller than two storeys nearby.
If anyone climbed onto a rooftop nearby, they would be discovered immediately. Therefore, Lu Shu was blatantly observing the dojo under the surveillance of dozens of members of the Collection of Gods.