This is the setup under the seat of my 800RE.
Both units are from bigpie, one of our members on here.
The one on the left has the ignition switched relay fitted on it & powers the spots, Sat Nav, camera, etc. The one on the right (special order from bigpie

) is permanently live (no relay) & powers the optimate lead, heated clothing & the USB you see there. (I use that for charging the comms overnight.)
I used the 'spare' switched connector that is behind that panel at the back. A bit awkward to get out, it's got a fastener pinning it down, but can be done without removing anything.