It is not necessary to place an electrical outlet in the area where a high reveal racking is located in order to plug in your lighting.  The cord will be able to reach down to the outlet placed in the dead space as far as 6 feet away.  If you would prefer to have the outlet located in this area for ease of access you will need to inform your design consultant to locate the outlets accordingly when they do the outlet placement design for you.  It is recommended that outlets for high reveals and other accent lighting, such as for archways, be placed on a switch.