In Seobase you are able to create trackings for both desktop and mobile platforms.
This allows you to track the ranking of your website on both platforms and to cover both devices, desktop and mobile. Which in return gives you more analytical data.
If a tracking for a desktop platform was already created, a mobile tracking for the same website can be cloned for the same domain with the same keywords for your ease of use.
If you have desktop and mobile trackings for the same domain, they count as TWO different trackings against your subscription.
Keywords for those trackings are counted twice as well, because two different SERPs are being monitored: on mobile and desktop devices.