Position of lighting current arrestor
Depending on what technology is being used for LPZ1, I would keep it as is shown.
F2 (usually thermal in close contact with the protection device) is there to prevent a fire if LPZ1 starts to cook off. But LPZ1 should also cause F1 to open if there is enough conduction at a power level high enough to open F1 but not create enough heat to open F2.