Ours is as Cummins12V98 describes, in center behinds the basement sliding panels.
Initially I found the small sliding hose port (enabling basement vacuuming) on the bag holding tray open causing no suction above.
It's still not much of a vacuum. We tend to use the floor sweep port under the stairs for the most part.
The Dyson stick has much better performance. We also keep a compact wet/dry vac on-board for those hope never happen issues.
Be well.
J&J plus a furkid
DRV Suites ES-38RSSA #9679
GM Denali 3500HD-Max 4x4, CC, LB, DRW