Reading Data from Multiple Accelerometers Using the LSM303 add-on for Arduino

I am trying to read and record data from three identical accellerometers connected to an Arduino MEGA2560. I was introduced to the LSM303 add-on that creates of sensor objects, allowing users to easily read data, however the example code proided here doesnt specify how the analog input pins are being selected. As I am trying to accomplish the task shown in the video for three units at once, I am unsure how to proceed.

https://www.mathworks.com/videos/read-lsm303-accelerometer-data-from-arduino-with-a-matlab-add-on-library-1489428633357.html

Here is the sample code I am using for setting up a single unit:

a = arduino('usbmodem145101','Mega2560','libraries','Pololu/LSM303');
sensor=addon(a,'Pololu/LSM303');

Does anyone have experience with this issue and can provide me with some insight into how to aquire the data properly? Thank you!