A mobile redirect plugin is simpler to accomplish a true mobile solution but with the power of Divi you can get a mobile solution without using a plugin or a separate page at all.
A few steps are required but simple to do.
Make your home page a blank template by setting the page attribute to blank page. The header logo and navigation will be missing, but you can add the a full width section for navigation and disable it on Phone.
Add a standard section under the the full width navigation and use the image module for your logo. This section can be placed below or above the navigation section. Hide this standard section on Phone.
Create a whole new section (Or get a layout from our store) that you want visible on any mobile device. Hide this section on Desktop and Tablets.
All the other sections disable them for Phone.
At the end of the day a mobile redirect plugin is simpler and offers less manipulation of your true homepage. Yes Google Mobile Friendly test will see and credit you for having a mobile site when using a mobile redirect. You can check out our mobile redirect post here.