I'm going to use this on a boat how or where would be ideal placement and best to power it with or ground it to ?
That would depend a lot on the specific boat. If the boat is metal the light will self-ground itself. If the boat is fiberglass or another non-metal material we recommend using machine screws and nuts to secure the light. A ground wire should be connected to one of the nuts. From there location would be based off where the power source is, where the ground is and where you would like the light to be positioned for ease of use.