Frame work for Fridge and Electrical system

Putting in the frame for the sink and the platform that will act as a area for the electrical inverter/converter/charger.  It will also raised the fridge up 16 inches.  This makes it easier to get in the fridge and allows for an area underneath it for a 20 gallon water tank, and all the electrical componants.

When the cabinet under the sink is cut out the water pump and city water hookup will be easier to get at.

The platform for the fridge will end up being 3/4 plywood mainly because I have a sheet of it and I might as well use it, and the strength of it.  The frige is quite heavy and when it is full of food it will be a heavy item bouncing around back there.  I am trying to come up with a good way to secure the fridge to the wall but am drawing a blank.  Thanks for any ideas.