When viewing the shopping products in a Product List it is possible to enable a slideshow of images on hover.
Go to E-COMMERCE> DISPLAY OPTIONS > Main/Category List Product Item Display Options
Click the checkbox Peak reveal additional images slideshow in the sidebar.
Your images are loaded as additional images when editing the product. Click the
Your image sizes should be consistent - e.g if the main image is square the additional images should also be square. You can use the crop engines aspect ratio options to crop the images to the same size/shape.