MiHome launcher has been ported by XDA-member Dadovvv, who has spent hours working to take the it from the Xiaomi Mi Max and make it available for other Xiaomi phones running on MIUI, Android 7.0. You will need root access and a root enabled file manager such as MiXplorer to download and install the modded application, and also to change your DPI. Your DPI must be below 440.
[appbox xda com.mixplorer]
To install the application, you will need to copy the application to the /system/priv-app/MiuiHome and delete the oat folder if it exists. Set the permissions of the file to 644 (-rw-r--r--) and reboot! The application should work and let you change grid sizes. Check out the port down below!