I hope I’m understanding your question correctly… you could use the same modal pop over for all devices, but if you wanted different looking menus on mobile and desktop then you’d have to do something like I demoed in the responsive navigation video from a few weeks back.
If you want the menu displayed differently at mobile and desktop breakpoints it’s only a little extra html to include it twice so it won’t impact performance.
Hope that helps!
P.S. Sorry I missed your questions, seems we got a lot this week 