This subject (and many related topics) are well covered in the forum, but here is a summary:
The terms of service for an account are that all receivers are physically located at a single address. This is enforced (partly) as a means to stop/prevent "account stacking" or account splitting where one account is shared amongst several people.
If *ALL* receivers on the account are at the BC address, then you can have a service address in BC and a billing address in ON.
If you wish to switch service between the locations, then you can use the Bell "cottage" policy calling them every time you want to switch service to either BC or ON, but both cannot be active at the same time.
Also as per your terms of service, your receivers are supposed to be connected to your phone line. This is the only outgoing communication and could be used by Bell to ensure all receivers are connected to the same line. If receivers are not connected to a phone line, you *may* at some point get a call from Bell to "verify inventory" and will be asked to provide information from the receivers.
A Bell TV receiver will work in any physical location that it can "see" the satellite(s) in orbit and this is not tied to your account in any way.