I feel I need to add one more module to the pre-existing Deco M4 3-module pack I purchased in December. However, Amazon now seems to only have the "1-pack" [a single module] from third-party sellers...

A TP-Link FAX states, A guest network allows visitors in your home to use the internet without needing to connect to your private network. Wireless devices connected to a guest network have no access...

OK - thanks Kevin. - Mike

[I own but have not yet opened or installed, a Deco M4 system.] A TP-Link FAQ for the Deco units states, "For some reason, if you want to change the slave Deco to work as the Main Deco but do not...