PowerPods for Power are better options than bracket mounting. PowerPods provide a clean look for flush mounting with the advantage of a swivel base. These have the advantage of protecting the back of the electronics from harsh saltwater spray. They also protect the plastic connectors and wires from deterioration caused by long term exposure to UV.
PowerPods for Sail are great for mounting on a flat surface, perhaps under the dodger or aft end of the cockpit table especially on boats with dual wheels.