Unet: Best way to Sync multiple variables

I'm pretty new to Unet and Networking. The biggest issue I'm currenlty running into is syncing my stuff to both Host(Server) and Client. Every time I think I know how it works, it just doesn't work like I expected.

I know I have to send something to the server with a [Command] and than sync it with a [SyncVar]. But this doesn't always work or is just to much if you have to sync multiple variables.

 private float InputAxis;
 
     [SyncVar (hook = "PlayerSpriteCallback")]
     public SpriteRenderer PlayerSprite;
     
     [SyncVar (hook = "ToolSpriteCallback")]
     public SpriteRenderer ToolSprite;
     
     [SyncVar (hook = "HandSpriteCallback")]
     public SpriteRenderer HandSprite;
 
     void Update () 
     {
         if(isLocalPlayer)
         {
             InputAxis = Input.GetAxis("Horizontal");
 
             if(InputAxis > 0)
             {
                 CmdDirectionChange(1);
             }
             else if(InputAxis < 0)
             {
                 CmdDirectionChange(-1);
             }
         }
     }
 
     [Command]
     void CmdDirectionChange(int direction)
     {
         if(direction == 1)                // Right
         {
             // un-flip the player sprite.
             PlayerSprite.flipX = false;
             
             HandSprite.sortingOrder = 2;    // Above Player, above tool.
             ToolSprite.sortingOrder = 1;     // Above Player, behind hand.
         }
         else if (direction == -1)         // Left
         {
             // Flip the player sprite.
             PlayerSprite.flipX = true;
             
             HandSprite.sortingOrder = -1;    // Behind Player above tool.
             ToolSprite.sortingOrder = -2;     // Behind Player and hand.
         }
     }
 
     void PlayerSpriteCallback(SpriteRenderer sprite)
     {
         PlayerSprite = sprite;
     }
     
     void ToolSpriteCallback(SpriteRenderer sprite)
     {
         ToolSprite = sprite;
     }
 
     void HandSpriteCallback(SpriteRenderer sprite)
     {
         HandSprite = sprite;
     }

This code only works on the Host (Server) and not on the Client player (I do have Local Player Authority selected). What am I doing wrong? Is it because I try to sync entire spriteRenderers? If so does that mean I have to sync every bool, int ect. in the direction change function? What if I have even more values I have to sync in the future, doesn't that end up in a gigantic mess eventually?