Is there a way I can make a model spawn where I want it to spawn?

Yes, you can just clone it and then move the whole model using the Moveto().

For more information look at the API documentation. API:Class/Model

This is a valid hypothetical script.

Model = script.Parent
Dialog = Model:WaitForChild("Dialog")
    BuyDialogChoice = Dialog:WaitForChild("DialogChoice")

Boat = game.Lighting:WaitForChild("Boat")
SpawnBoat = workspace:WaitForChild("SpawnBoat")
SpawnPos = SpawnBoat.Position

Dialog.DialogChoiceSelected:connect(function(Player, DialogChoice)
    if DialogChoice == BuyDialogChoice then
        -- Check to see if the right DialogChoice is selected
        local newBoat = Boat:Clone()
        newBoat.Parent = workspace
        newBoat:MakeJoints()
        newBoat:MoveTo(SpawnBoat)
    end
end)

Please re-parent your Boat to game.ServerStorage. It's recommended, because that's what it's built for. Storage.

Model = script.Parent
Dialog = Model:WaitForChild("Dialog")
    BuyDialogChoice = Dialog:WaitForChild("DialogChoice")

Boat = game.ServerStorage:WaitForChild("Boat")
SpawnBoat = workspace:WaitForChild("SpawnBoat")
SpawnPos = SpawnBoat.Position

Dialog.DialogChoiceSelected:connect(function(Player, DialogChoice)
    if DialogChoice == BuyDialogChoice then
        -- Check to see if the right DialogChoice is selected
        local newBoat = Boat:Clone()
        newBoat.Parent = workspace
        newBoat:MakeJoints()
        newBoat:MoveTo(SpawnBoat)
    end
end)

If everything is perfect, the whole universe is in harmony, the planets are aligned, the comets are streaking, then this should work. BUT. Not until you set the PrimaryPart of your Boat model!

A PrimaryPart is a BasePart object that gives you the options of using either the :MoveTo() or the :SetPrimaryPartCFrame() method.

To set the PrimaryPart of your Boat model, type this in the command bar:

game.ServerStorage.Boat.PrimaryPart = game.ServerStorage.Boat.Engine
-- You can set it to anything, but it HAS to be inside the "Boat" model

So the Boat model should look like this, with the PrimaryPart property not blank.