Best practice for Lightning/Surge Protection on PCB
I personally would not parallel TVS and MOVs. If you look at the voltage/current curves for similar voltage protection devices, typically you will find that the TVS will take all of the current as the MOV has a soft "knee" (voltage across MOV has to go quite high before an appreciable current is drawn).

I have seen MOVs used with spark gaps in several designs. To the best of my knowledge, spark gap devices will take a very high current, which is why they are used for lightning protection, but have an imprecise "flash over" voltage which can also change after a few sparks.