RectUtils.cs

using UnityEngine;
using System.Collections;

public static class RectUtils
{
    public static Vector3 RandomPointInBounds (this Rect rect) 
    {
        Vector3 point = new Vector3();
        
        point.x = Random.Range(rect.xMin, rect.xMax);
        point.y = Random.Range(rect.yMin, rect.yMax);
        
        return point;
    }
}