Design Testimonial Template in Canva for use on LinkedIn

I want a customisable template designed in Canva that I can use to showcase client testimonials on LinkedIn. If it is possible to edit the template in the free version of the platform, please let me know. As I am an occasional user, I would rather not incur the expense of a subscription.

I want the template to include my company's branded colours and show my company logo discreetly. Some clients are happy for their photo to be shared, while others are not, so I'm unsure if two templates will be necessary or if instructions will be provided to remove the photo space from one template.

It would be beneficial to be able to use the template on other social media platforms as well.