how to make a stand behind your player? with vector 3

local repStorage = game:GetService("ReplicatedStorage")
local RemoteEventFolder = repStorage:WaitForChild("RemoteEvents")

local function SummonStand(plr)
    local Stand = repStorage.Stands.TheWorld.Stand:Clone()
    Stand.Parent = plr.Character
    Stand.Position = plr.Character.HumanoidRootPart.Position + Vector3.new(0,1,3)
end

RemoteEventFolder.SummonStand.OnServerEvent:Connect(SummonStand)

tried this script but vector 3 is not a valid member vector 3

Im kinda bad at vector3 and that type of stuff

Also will i need to take into the orienation of the player or is that not nessary