The Assignment add-on for Strong Testimonials allows you to assign testimonials to just about anything in your WordPress site.
If you are currently using categories to segment your testimonials, Assignment provides a simpler approach and more granular control.
This demo shows the most basic setup: Using standard pages to describe services and assigning testimonials to those pages.
Each page has the same two shortcodes: one for the testimonial list and one for the testimonial form. Each shortcode adapts to the page.