After spending a lot of time typing countries into several sites, including ones I have used before, I was a bit over it, and also some even max out at about 12 countries, what then? I think there are more than that in Europe.
Also, as we don't have a fixed itinerary, we can change things at any time.
So it's easily fixed for me now, I won't use those that don't have a "Europe" or "Worldwide" option and in the end the one I have chosen has a "Worldwide, less North America" option and it also seems to be the best for us, both oldies.
But of course as usual, ymmv.