c# : Accessing Struct variables inside an Array

I am creating a grid of 10 x 10 boxes (Up to 100 x 100)

I would like to take a struct and initialize an array to a specific size.

If you suggest another method to achieving this result, please include an example.

public struct Box { // The struct used in the BoxArray public int firstModel; public Vector3 firstLocation; public int secondModel; public Vector3 secondLocation; public bool emptyBox; };

         public Box [] BoxArray;    //    Initializes the arra
         
         public class DoStuff : MonoBehaviour{
             //    How do I access and set the variables in BoxArray[5]? // using 5 as an example
         }