Help with ultrasound sensors project

I am making a project where I want to connect multiple ultrasonic sensors to cover all 360° without interruptions. I’ve read that if you connect them in a triangle, it does the same thing. Someone please explain this or if there is something better I can do please Suggest.
Thank you!

The HC-SR04 sensors have a 15 degree measuring angle so you would need 24 of them to sense 360° without interruptions. Or you cold make 1 sensor rotate to measure all directions like this: http://www.instructables.com/id/DIY-360-Degree-SODAR-Device/