Child sheet for plugin needed? Customizing Directory , Change grid layout

Site http://bcosc.com/memberlistings/

I have a multi-part question.

1. Should you make a child sheet for the Directory Plugin if you plan to make a few customizations (if so how is this done)

2. I am having issues with the grid view. If the line is long enough to spill over into two lines it throws the grid view off. See site for example. I think I can change this by changing the grid to 3 columns and making each column wider; however, I do not know how to do this.

Thanks in advance