I have used Pixrl for creating my mockups. I couldn't find any tutorials for Pixelmator Pro.
This is an example of one of my mock-ups.I buy the mock-ups and then insert my designs.
Mock- ups
2018-06-21 07:42:43
Hi Marion, could you share one or two of the mockups with us at support@pixelmator.com? We can take a look at what features you'd need and maybe give you some advice on how you could use those files in Pixelmator Pro.