• Use PowerPack team module OR UABB team module
• PowerPack: slider option only, has choice for horizontal OR vertical layout (no box layout), can have up to 3 columns sliding in carousel form, has various layouts, does NOT have option for ratings
• UABB: can have box layout OR slider, can only slide horizontal (no vertical layout), can only have one testimonial slide at a time, HAS the option for ratings BUT ratings can only be a whole number - e.g. they can't have 4.5 stars - its either 4 stars or 5 stars

Make sure to ask if they are planning to add more than 5 or if they plan to add more in the future. If so, they shouldnt use this module, rather, they should have their testimonials set up as a custom post type instead. Once set up as a post type, their layout options will be a feed or a slider / carousel. Reference the archive version for demo.