Here's how you can place your Wall of Love on your page horizontally with a masonry layout.
Open the space where your Wall of Love is located on your dashboard page.
From the left sidebar, hit on Wall of Love under the Embeds & Metrics options.
Choose the first layout, Masonry Animated.
From there, choose horizontal under the scroll direction option.
After adding the other customization you want, you may now copy the code.
More information about embeds can be found here.