Discuss the role of strategic human resource management (SHRM) in driving organizational success. Explore the integration of HR strategies with overall business objectives, emphasizing the alignment of HR practices with the company's mission, vision, and goals. Evaluate the impact of SHRM on enhancing employee engagement, talent acquisition, retention, and development within a dynamic and competitive business landscape. Additionally, analyze the challenges faced by organizations in implementing effective SHRM initiatives and the strategies to overcome these obstacles. Provide examples of companies that have successfully leveraged SHRM to achieve a competitive advantage and sustainable growth.