RandomPosition2D.cs

using UnityEngine;

public class RandomPosition2D : MonoBehaviour
{
    [SerializeField]
    private Color colorOfAreaInEditor = new Color(0.5f, 0.5f, 0.5f, 0.2f);

    private float xRange = 10f, yRange = 10f;
    private float OffSetValue(float valueToOffSet, float range) => valueToOffSet + Random.Range(-range, range);
    
    private void OnDrawGizmos()
    {
        Gizmos.color = colorOfAreaInEditor;
        Gizmos.DrawCube(transform.position, transform.localScale);
    }

    private void Awake()
    {
        InitializeRangeValues();
    }

    private void InitializeRangeValues()
    {
        xRange = transform.localScale.x / 2f;
        yRange = transform.localScale.y / 2f;
    }

    ///<summary>
    ///Will choose a random position inside this area (X, Y).
    ///</summary>
    public Vector2 RandomLocationInsideArea()
    {
        return new Vector3(OffSetValue(transform.position.x, xRange), OffSetValue(transform.position.y, yRange), 0);
    }
}