Power supply for ROVL MKII

Hi all,

I have a question about installing the transmitter on the ROV. The installation guide uses a 5V 6A step down/power supply to power the transmitter on the ROV, yet looking at the specifications for MKII transmitter on the website it recommends powering it with >9V. Are we okay to wire the transmitter directly into the power board which supplies most of the other components on the ROV or do we need to purchase a step down?