[Help Wordpress] How do make multiple rows of thumbnails?

I would like to have multiple layers of thumbnails, such as in the example at http://dimsemenov.com/plugins/royal-slider/gallery-with-deeplinking/ .

I would like to set up a slider with horizontal thumbnails such as in http://dimsemenov.com/plugins/royal-slider/gallery/ , however I would like to have two or more rows of thumbnails, so that more thumbnails are visible without scrolling.

An example of what I am looking for is http://www.scoutbooks.com/shop/worthe-numerals-notebook-box-set/ . There you can see they have room for 2 rows of images.

I'm thinking that it should be possible, as http://dimsemenov.com/plugins/royal-slider/gallery-with-deeplinking/ shows three rows of images.

Please let me know how to do this.

Thank you,
-Andrew

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