Calculate route/path of a ball using Raycast

I want to create waypoints once i press a button. I want to shoot a ray, which can bounce off walls and once it hit the wall it instantiate a gameobject as waypoint on hit.

What i have so far:

 void Update () 
     {
         Ray ray = new Ray (transform.position, transform.forward);
         RaycastHit hit;
 
         Debug.DrawLine(ray.origin, transform.forward, Color.red);
 
         if (Physics.Raycast (ray, out hit, rayLength, WallLayer)) 
         {
             Vector3 reflectdir = Vector3.Reflect(ray.direction,hit.normal);
             ray = new Ray(hit.point, reflectdir);// is this the right way?
 
             Debug.DrawLine(ray.origin, hit.point, Color.blue);
 
             if(hit.collider.gameObject.tag == "wall")
             {
 
                 Instantiate(WayPoint, hit.point, Quaternion.identity); //everytime the ray hits the wall create one
             }
         }
     }

Any Ideas?