Hello @RBC379 

You can add the kasa switches in the home under the same TP-Link account (email address), and both home & cottage's kasa devices will show up in the Kasa APP. 

- Login your TP-Link ID , you will see the kasa switches available in the APP that already bound to your account 

(Kasa smart devices is accessible remotely in Kasa APP after it connects to your Wi-Fi and get internet. )

- add new kasa device in the Kasa APP  directly under the same TP-Link ID. 

Hope the information here helps.