12VDC Appliances are just not my cup of tea... Too much current for the standard 12VDC wall plugs you find.
I would get just a 300WATT PURE SINE WAVE Inverter to run all of your 120VAC home entertainment center items... Thats about all you need...
The electronic items really want to see PSW type Inverters. Used to be the cost difference was so large but these days there isnt much difference between a PSW and MSW inverter cost wise. I run a 600WATT AIMS PSW Inverter and it cost $149 a few years ago.
When running PURE SINE WAVE you don't have to worry about blowing something expensive up..
I wired in two 120VAC extension cords out of sight coming from my two 120VAC receptacles on my Inverter. The only thing you can see ins the multiple 120VAC plug in of the extension cord on the back side of a table. One went to the home entertainment cabinet area and the other one went to the bedroom table area. Serves me well for all of my 120VAC items I want to run when off the power grid.
Roy Ken