Not really stored I guess. Both the Performer and the WSM either on the open patio or in the screened in porch. Depends on where they were used last. That's usually where they stay.
Last several years they remained on the patio.
Covers on both. Vents open. Ash is always removed after a cook. I turn the mid section of the WSM upside down after each use/cleanup - no water intrusion that way. The covers leak.