Two separate internet accounts with separate services at the same address.

What is involved in setting up a second xfinity service account at an address that already has an in-use service? The property has a large garage with a separate electric utility meter with its own address for the power company, not a registered UPS separate address. Is it possible to get a separate access point installed in the garage and run across the power lines going to the garage, or will I better off getting a business account and service to run from the primary residence on the property? The garage has separate incoming overhead power lines from the primary residence on the property. I greatly appreciate any help or even what phone numbers to call.