Two GP Listings With Same Address?

Hey guys, I have a questions that I have not been able to find an answer to anywhere on Google.

I have two clients that are brothers (I got the roofer as a client, he then referred me to his brother). They both do contractor-type work (one does roofing, the other does plumbing), and they live together in the same house. There are no suites or apartments in this house, but they want to both have their own GP listing because they are separate businesses.

How would I go about making them their own separate listings? Do I just use the same address for both of them, or do I attach suite numbers for each of them?

I was reading on Google and some people were saying that as long as all the info (phone number, website, category of business, etc) was different, you could have the same address. I called the post office and asked them if they would deliver to a house that had a suite number, they said they wouldn't unless it was registered with the city, so I don't think that would work (unless they actually would and he was just lying).

Anyways, can anyone help me with this? I don't want to do the ups store route, because I feel that Google will eventually stamp down on that and it will be useless. Any help?

Thanks in advance!