I've been here for two months now, and I wouldn't say that charger availability is any better that the UK, but then I've never seen a charger queue in the UK.
Teslas are far less common than in London - but there's no such thing as a French manufactured Tesla.
But you'll have no difficulty at all topping up on motorways, at Hypermarkets and Supermarkets. Often for free at Carrefour, as previously discussed, and randomly free at places like Marinas.
Roadside chargers? Not so much
The only cause for concern in Switzerland? Impromptu runs into the mountains with only a third in the tank. I had to do a 100 mile round trip to pick up a stranded cyclist from the Alpilles and I wouldn't have liked to have done that with "half a tank of juice." Would have been fine if there'd been hotels and towns around, but there weren't = at least not that I noticed. But I wasn't looking at a Zapmap.
What's the supercharger situation for the Hyundai these days? Can it connect to the V3 yet ?