I actually have the morimoto ballsts as well (their 55 watt white ballasts) from TRS.
Driver side:
Its mounted to the bolt that holds the fuse box to the chassis. I just bent the metal bracket on the ballast to make it fit.
passenger side:
I attached it to a bolt that holds the relay box to the chassis.
Wiring:
If you look at the driver side pic, there is a bar that goes across the battery. On the right side of that bar (just out of sight on the right of the pic) I attached the TRS wire-harness to that.
It had easy access to both battery terminals, and the driver side headlight input socket, though the wires were just barely long enough to reach the ballasts. I ran the wires from the harness to the passenger side ballast over the radiator, along the edge of the engine bay. Ziptie'ing it to things to keep the wire from directly contacting the radiator itself (or any hot components). Tucked all the wiring on the driver side below the battery.
Also this is an 08, not sure if it has the same bolts in the engine bay as a 2011+, but the ones I used to mount should be the same.
Edit: this is now the wiring setup for the lights (and yes all 6 relays are used for the lights)