no water res there. mine is stock air system.
I have it Velcro attached fwd of battery and just behind the intake.
I don't use/need/have the power options as it seems plenty enough for me now.
I do have the handgrips, aux lights, GPS, dual heater seat, three power taps (one for helmet comms charger, one for phone charger, one spare) and battery tender pigtail.
Works great.