My logic tells me both, the owner probably doesn't own the rights to home design (unless actually transferred by designer, which we know 99% didn't happen), yet you need a signed permission from the owner for that particular home. If I'd want it to be 100% transparent and I know it will sell like hotdogs, I'd get both.
But my logic also tells me that designer/team of designers/manufacturer, unless high profile and really proud of their unique designs, will never see or care or know that the photos are on sale without their permission, so I'd just get the owner signed and don't bother much more.