"Parasit shelves" is the only solution if you want to make more profits with little creativity and money invested. This is the way to get additional sales space, but also the ability to highlight and promote specific products.
The basic tool of the concept of cross-presentation of goods (in literature this concept is known as Cross Merchandising) is precisely the "parasite shelves". By their design and placing them on existing shelves, they select a certain article out of the offer. This type of shelf is mounted on existing gondolas so that they "leak" out of them and thus draw customers' attention to specific products