At that price, it's worth buying one and taking "Just in case".
We've been (to France) twice so far, and haven't needed it, as many sites have the "commando" socket as per the UK.
We're planning on overnighting en-route in our tent next month (as opposed to a hotel), more than likely on municipal site(s), so who knows, maybe we'll get to use it this year.
Location: Capel le Ferne Joined: 26/9/2015
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Adding a Ground or earth spike to system, in some cases is a good thing, and in some a bad thing, it depends what the system earthing in use at the campsite is.
For that reason unless you a qualified Spark and Know the earth system in use at the camp site, I would advise you to steer clear of ehu's with a ground/earth spike