You may want to enable and configure the Auto align feature.

The default values are:

Auto-align vertically: off

Vertical distance: 10pt

On the Added Objects subtab of the Extra tab on the Preferences dialog box, tick the auto-align vertically, and then set the desired vertical gap.

The functionality is described in Auto-align objects to other objects with a vertical gap,

Note

This functionality uses the variables PO_AutoAlign, PO_Dist.