This recommendation applies to a Grid View layout, which is most relevant for very visual products without a lot of specs (e.g. clothing and apparel).

 

On desktop (on a 22″ screen), it’s good to note that many of the big brands I looked at choose to display 4 or 5 products per row:

 

 

 

On mobile, most opted for 2 products per row, with a few exceptions:

 

 

Interestingly, B&H and Crutchfield have a consistent layout on both desktop and mobile, with 1 product per row on both devices.