The only way to help avoid stone chips in the paint is to apply PPF - PAINT PROTECTION FILM.
I had my other car fully covered 2 1/4 years ago prior to taking delivery.
The product is a clear film applied to the car which helps minimise Stone chipping and scratches to the cars paintwork. The product I have - Xpel self healing film also has the ability for light scratches to be repaired when exposed to heat, such as a hairdryer.
However its not a magic solution, and it's not cheap. The cost for my car, albeit at a shade over 5 metres long was not far short of £5,000.00!! So you have to be an obsessive like me!!
Also whilst it will stop MOST stones from damaging the paint, big impacts will penetrate the film, and whilst light stones won't get through, they will leave surface marks on the film. In the time I've had my other car, there are a few very light marks where a stone has hit and just grazed the films surface.
As I say, it's about how obsessive and fussy you are, as even the marks I mentioned above are very tiny and all but invisible to anyone looking at the car, it's only if you're seriously OCD like me, that they will bother. The main idea is to keep the original paintwork as perfect as possible.