Power Distribution Blocks, Is it for my type of installation? Options

[MauiBuilt]

I have a pair of Power Acoustik HD-7 universal headrest monitors that came with an A/V controller for each monitor. The A/V controllers require to connect a power wire, acc wire and ground wire. I plan to mount the A/V controllers under the front driver and passenger seats. I already have a power amplifier connected under the driver seat. Is is where a Power Distribution Block come in, were I connect one power cable from the car battery to the block and run the rest of the power/acc wires of the amp & monitors to the block? Let me know if this is right or wrong. Also open to other suggestions on this type of installation.