How do you show multiple testimonials in rotation

Use the carousel options of Testimonials Premium.

Example: Show horizontal carousel with 3 rated testimonials.

[testimonials_slider carousel_count=3 transition_mode=horizontal slide_width=250 slide_margin=25 slide_margin=25 require_ratings=1]

Example: Show vertical carousel with 2 testimonials.

[testimonials_slider carousel_count=2 slide_margin=50 transition_mode=vertical]

Old Way

The easiest way to rotate multiple testimonials at the same time would be to use the unique shortcode or “Prevent duplicates?” widget options with one or more Testimonial Widget instances. This gives you the ability to place or stack testimonials together that rotate at the sametime without fear of showing duplicated testimonials.

Try something like the following code.

[testimonials_slider unique=true]
[testimonials_slider unique=true]
[testimonials_slider unique=true]

The `unique` AKA prevent duplicates capabilities are a part of Testimonials Premium.

Further, in case the first widget rotates but all of the other widgets on the page state "No testimonials found", then read up on "Only 2 of many testimonials are showing".

Testimonials Premium plugin extends the best Testimonials Widget plugin for WordPress with caching, excerpts, filters, read more links, more selection options, and advanced capabilities like selecting posts, pages and other custom post types as testimonials. Additionally, users can add testimonials via a front-end form shortcode or widget.

Please purchase the premium plugin.