Even if not accessible from your seated position, or even if not accessible from the driver's compartment, it really opens up the options of a much more effective weapon available in relatively short order.
Cheap pump action shotguns are less than $300 brand new. No need to care if they get banged up a bit in the trunk or under the seat. Just remember in NV, you can have the magazine loaded, but not the chamber, when it comes to rifles and shotguns.
And yes, you can put it in a vertical rack in front of the dash if you really want to. We get to be armed the same as the police in this state. They carry sidearms, and have empty-chamber shotguns in the car.