DIY landlords who may only have a few rental properties have often asked to inspect their NEW rental prospects' current home. This LAST step in the process has been around for decades.
Many are making an appointment to come and view their prospects' current homes and this advance notice negates the idea that they need to see how the prospects keep their homes and live their lives "normally".
As a professional property manager, I know that laundry piles up, dishes stay in the sink and litter boxes can overflow. I want the property cleaned when property is shown to prospective new renters and I want the property SPOTLESS when my residents depart.
I deliver their new lease packets to approved prospects at their current home for their review and signatures. THAT is when I view the yard, drive and surrounding areas.
As for inspecting their prior residence BEFORE I agree to rent to them, I think this is over-kill and shows that the DIY landlord is unsure of their renting process.