The DCDC board does not power the ADC monitor, the brick provides the 28V supply. Since you have only a Single 800, you should be OK, but I'd put the brick supply on a stand or something to help cool it, that's where the ADC monitor gets it's power from. I took one apart once, the only way air gets into it is from the ends, so standing it up on one end should create a chimmney effect as heated air exits the top, cool air is drawn into the bottom AC power cord end.