Hello  @Tomato 

Yes, you can set up Tapo smart devices in different houses in one Tapo APP. 

In House A:  setup tapo plugs there using Tapo APP, and devices will be associated with your TP-Link ID and remotely accessible in the app. 

Then in House B: open tapo app, login the same tp-link account, you will the existing plugs in House A, then you can add more plugs in the house B.

Smart devices in different locations will all show up in the app after they connected to interest. 

Hope this helps answer your question.