Sorry but that’s wrong. Both regarding luggage being held overnight (no problem as long as it’s less than 24hrs) as well as the hotel. Well. For the second one it’s obviously just an opinion but it seems everyone but you prefer a city hotel. With an early evening arrival and mid day departure I would strongly suggest to stay in the city. The radisson blu is convenient indeed, but for such a long layover Staying in the city will simply make more sense. An evening at an airport hotel? Doesn’t sound like much fun to me, when the alternative would be to explore ZRH downtown instead.
there might be cities where heading into „downtown“ would be more tricky on such layover, but in ZRH it’s literally a no brainier to me.