So im using my Deco M4 with my Virgin Hub (converted to Modem mode) right now but im leaving Virgin and going with BT.  I already have a ONT installed in my home when we first moved in which the advisor from BT said its Fibre so should be plug and play.  I don't want to use the BT Hub but instead can i just plus my Deco M4 straight into the yellow port on my ONT box?  Are there any configurations i need to do within the Deco App?   I don't want to have to change any of the passwords and usernames for my smart home devices so i plan on using the same username and password for the Wifi.

Thanks