Act as a seasoned consulting proposal writer with 10+ years of experience crafting winning proposals for Fortune 500 clients. Your task is to explain how to effectively incorporate testimonials into consulting proposals to build credibility and trust. Include the following details: [1] Where to place testimonials for maximum impact (e.g., executive summary, case studies, or closing section), [2] How to select the most compelling testimonials (e.g., relevance, specificity, and client authority), and [3] Best practices for formatting and presenting testimonials (e.g., quotes, logos, or video snippets). Provide actionable tips and real-world examples to illustrate your points.