When installing an amplifier, it is important to find a location where it will operate the best. Amps can be sensitive to electrical motor noise and could retrieve interference from a nearby radio. The amp needs to be installed at least 3 feet away from its receiver with just a few screws.
Once the amplifier is in the position you desire, mount it in the direction you want and screw it in on the corners. The amp could heat up while in use. Try to provide an inch or two of air space around the cooling fins so they can operate correctly. Also, leave some extra room while screwing it in for the wiring to be assembled.
Basic wiring for amplifiers includes a power and ground cable, a circuit or fuse breaker, all of the connectors you'll need for the given amplifier and a thin piece of wire for the turn-on lead.