How to make random coin spawn position?

Hello,

I have this follow Coin Script:

`currency = "Coins" -- Change Gold to the currency you want to give amnt = 10 -- Change 50 to the amount of money you want to give debounce = false -- Don't change this

function onTouch(hit)
    if hit.Parent:findFirstChild("Humanoid") ~= nil and debounce == false then
        if game.Players:findFirstChild(hit.Parent.Name) ~= nil then
        local player = game.Players:GetPlayerFromCharacter(hit.Parent)
        player.leaderstats:findFirstChild(currency).Value = player.leaderstats:findFirstChild(currency).Value + amnt
        script.Parent.Transparency = 1
        script.Parent.CanCollide = false
        debounce = true
        math.randomseed(tick()) --To make random randomer
        wait(math.random(10,20))
        script.Parent.Transparency = 0
        script.Parent.CanCollide = true
        debounce = false
        end
    end
end

script.Parent.Touched:connect(onTouch)`

but now I want that it random spawn on the map and not on fixed positions. How I can do that?

Thanks a lot!