To display only single family homes:

[rover_idx_full_page prop_types="singlefamily"]

You can use additional valid shortcode parameters to more precisely define what you would like displayed.  For instance:

[rover_idx_full_page prop_types="singlefamily,land" min_price="300000"]
[rover_idx_full_page prop_types="singlefamily" waterfront="true"]

*  If you do not include the prop_types parameters, Rover IDX will always assume the list of checked property types in Styling >> Search Panel >> Property Types.

** See Rover IDX shortcode help for more info