I've used several Brodit active chargers over the years, changing the charging plate each time I upgrade my mobile phone. You do need to first purchase and fit the correct baseplate for your vehicle, and then you simply screw the suitable phone holder to the front. Take care not to drop the screws - they're really small and a devil to find on your car carpet!
The 'passive' chargers are almost identical but they don't have a charging cord, they simply hold the phone in place. I want to know my phone is charged at all times, especially on long journeys, so the active charger always made more sense to me.
The mounts are all made to precisely match the phone they're designed for. A nice snug fit that guarantees your phone charges all the time the car engine is running. Not the cheapest solution for sure, but certainly the best in my experience.