Slider in the products grid

[giodapolito]

Hello ,
 
on this site http://www.elegancehairextensions.es, in the second line of products, there's a slider, followed by other two products.
 
I tried to change the size and location of the default homeslider and tried to move it ( modules - Positions ) but I can't place the slider there, in the products grid.
 
Does anyone have any idea how to do it ?
 
The theme is ThemeForest, it has its own slider module but, as above, I can not move it to the position I want.
 
I use Prestashop 1.6
 
Thanks in advance.