How to manage Adsense responsive ads

Hi,

I would like to use a specific format of Adsense ads in my website for the desktop view, and a responsive ad for mobile and tablet views.
Basically, when the visitor reads my website in a laptop or desktop, I would like a ad of a specific size (a custom size Adsense ad, such as 614×330) to be shown. When the visitor reads from tablet or mobile, I would like the responsive ad to be shown, with size depending on what Google sets (the responsive ad would be using the code from Adsense).
So, I’m looking for something that will allow me to show different ads (in different zones), based on device width-
My theme has a feature allowing me to control two of the ads location – but I’m having some issues with this feature.
If you need the info, the website is https://www.ottimizzazione-pc.it.
Any suggestions on ways to manage this, or on plugins able to let me do this?

Thanks