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I think you can try, but it may still happen sometimes.  Here's what Google instructs for how to focus on mobile only extensions. You can change how an existing sitelink or call extension works on mobile. Here's how to customize an existing extension for mobile devices: Choose the enhanced campaign that has the extension you'd like to edit. Click the Ad extensions tab. On the View drop-down menu, choose the type of extension you'd like to edit. From the drop-down menu next to View, choose Upgraded. Go to the [Extension] settings section and click Edit. You'll see a list of all the extensions in this campaign. Hover your mouse cursor over the extension you want to customize. Click the down arrow that appears next to the pencil icon and choose Copy and edit. This creates a copy of the extension. In the form that appears, choose Mobile next to device preference. Change the extension, as needed, to optimize for mobile. Click Save. Note Mobile-optimized extensions (extensions for which the Device preference have been set to Mobile) will be given preference over standard extensions of the same type (such as sitelinks or apps) on mobile devices. Standard extensions will be given preference over mobile-optimized extensions of the same type on desktop and laptop computers. If a campaign or ad group has only mobile-optimized extensions, these may show on desktop and laptop computers. To avoid this, we recommend having standard extensions of the same type as the mobile-optimized extensions in your campaign.

Thanks for trying us out Nat.   Drop me a line sometime (jarrod@textlinkbrokers.com) and let me know how everything is going.  We are always looking for feedback. Best,