I was really excited when it was delivered. Well packed. I hired a professional guy to install it. Installation wasn't that easy. Screws (ph-sd366924-cc) are too short, doesn't hold the parts.  Connectors (ph-kdcznc001) breaks easily. Mounting rail was already installed by the professional when I found out the problem. That's why couldn't even return. Now I had to use extra brackets to join the parts.