Unity, how to have multiple 2D collider on single object

I have a tower defense game. I want to modify the walk animation of ennemies, so that depending of their position on the map, i can use front, left, right walk animations.

I want to use 2D colliders, so that when an ennemies enter inside the new zone, i can detect with TriggerEnter and change the animation of the Walk.

Which kind of collider should i use to achieve this ? I mean, Which collider should I use to have different colliders side by side like in the image ?

Thanks.

Update:
In this example you can see ennemies moving following a path and in this situation, i should detect the position to have another animation, for example profile walk.

There are 2 ways to achieve the face direction.

1. First Method

You can compare the current X-Axis with the next one and simply flip your sprite on the X-Axis.

private float _currentPosOnXAxis;
public SpriteRenderer _spriteRenderer;

private void Update()
{
    FaceDirection();
}

private void FaceDirection()
{
    if(transform.position.x <= _currentPosOnXAxis)
    {
        _spriteRenderer.flipX = true;
    }
    else
    {
        _spriteRenderer.flipX = false;
    }

    _currentPosOnXAxis = transform.position.x;
}

2. Second Method

The second method is similar to what you have already tried. Basically you use multiple checkpoints objects not as triggers but as position points. You have a list of points on the world that each enemy should follow in a specific order and you check the enemy's X position with the next checkpoint X position.

So what you check is that if the enemy's X position is bigger than the checkpoint X position, that means the enemy is on the right side of the checkpoint so the enemy is moving to the left, but if the enemy's X position is less than the checkpoint X position, that means the enemy is on the left side and is moving to the right.

You can use a list of all the checkpoints and you start from 0 index and you can use a trigger to determine that the enemy has pass through the checkpoint and increase the index number.

public SpriteRenderer _spriteRenderer;
public List<Transform> _checkpointsTransforms;
private int _currentIndex = 0;
private float _checkpointXPosition = _checkpointsTransforms[_currentIndex];


private void Update()
{
    if(transform.position.x > _checkpointXPosition)
    {
        _spriteRenderer.flip = true;
    }
    else
    {
        _spriteRenderer.flip = false;
    }
}

private void OnTriggerEnter2D(Collider2D col)
{
    if(col.CompareTag("CheckPoint"))
    {
       _currentIndex++;
       if(currentIndex < _checkpointsTransforms.Count)
       {
           _checkpointXPosition = _checkpointsTransforms[_currentIndex];
       }
    }
}

Note: Remember to set your Tag accordingly

I would recommend the first method because is much more faster and it requires less memory. Also the second method it means that for each map you need to create all the checkpoints that you need and all the enemies should have a reference to those checkpoints and so on.

I finally used this solution. Thank you all

            Vector2 currentDirection = (points.ways[wayIndex].wayPoints[wayPointIndex].position - transform.position).normalized;
        if (Mathf.Abs(currentDirection.x) >= Mathf.Abs(currentDirection.y))
        {
            //Character is moving sideways
            if (currentDirection.x > 0)
            {
                print("Move Rigth");
            }
            else
            {
                print("Move Left");
            }
        }
        else
        {
            //Character is moving straight

            if (currentDirection.y > 0)
            {
                print("Move Up");

            }
            else
            {
                print("Move Down");

            }
        }