Using Schlage App with Homey - But no status if door is locked/unlocked, battery life, etc

No, you can use trigger (a.k.a. WHEN) flow cards to send messages (like Timeline, Push Notifications) :

But it should be visible with the little lock icon on the device tile, without using any flow. But it’s veeeery subtle.

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See answer 1.)

Not sure what you mean. When you add them to the “favorite devices” screen, you can put them next to each other

You can request @ app developer*** to add a"string" type capability which reflects the status with words (locked/unlocked) as status indicator

On a Pro it"s possible to do that yourself by using a virtual device, as you can see on the tile on the left @ my screenshot.

Upgrading to Premium doesn’t make a difference in this situation:

***) On most homey.app store app pages you’ll find info about different ways of app support.