My vote would be for one each. That’s fair for everyone, IMO. Houses with more than one collector could get one each – houses with one collector would get one each. No weirdness if you live with 20 people in a commune who all collect.
Also, if you want to be sneaky and make extra accounts, it’s probably faster to order 2 per house and send them to work, your mom, etc, than to set up accounts and order them one at a time…