How do I place my items on the map so that players can redeem and access them at any time?

[Zim_TechArt]

As mbestie mentioned, the item spawner and vending machine are the most common devices for picking up items in-game, and I would start there.

You can find more information here:

Using Vending Machine Devices in Fortnite Creative | Fortnite Creative...

Using Item Spawner Devices in Fortnite Creative | Fortnite Creative...