ARB makes a lot of stuff, but I assume you are referring to the air compressor?
You don't need everything to go on the same mount... most installs I see for the air compressor are on the passenger side with most general electrical on the driver.
Some systems require a PS relocation kit depending on the generation of 4Runner and the pump you select.
"(x)th gen 4runner arb compressor mount" would be a good place to start.
As for the fuse block, unless you are running a variety of electrical accessories, you could get away with less if its just the compressor, or you could buy into a system.
You have a lot of options, including just making something custom, which is what I did.
A good starting point would be to list out all the electrical modification you want to make first so you can pick a load center that works best for you.