I bought a Shuko adapter for this years trip to France, we stayed on 7 different sites and I never needed it, but it is good for emergencies when they arise.
All the sites we stayed at had the Uk type of hook up, and although the amperage may vary from site to site you will still be on 220/230v so everything should work fine.I never yet used my polarity checker, again I think this harks back to days gone by when lx was a bit iffy on sites.
Have a great trip ,
Highmiler