All great insights already here Winn, but if you are able to oversee the painting, there are some ways to help with this often unavoidable turn over expense....For example, this time insist on some high end paint (think specialty paint store or the very best big box stuff); try a pearl or washable finish; I like one color for all the interior of all my units, ideally a white that can hide some imperfections (know and keep the code); this means no color or matching mystery later; then on the next turn over, see if you can't get away with just a wall cleaning; use a damp sponge mop with tsp or a tsp substitute  (and then rinse it with a clean water and a damp sponge mop)..not too much water, just damp.. 

If they fall into the ocean, I'll take NV.Internet info is totally imperfect, but it doesn't take much to learn just a little bit about how it works elsewhere,  Takes very little to read rulings and regs by the Feds.  

I always have knock down ceilings  in my rentals, look nice and they hide imperfections .Pop corn  ceilings here are a sign of a outdated, unit they must go ! 

The thinner ones shows every imperfection in the subfloor.

Stained or just poly-ed cabinets hide imperfections much longer.Painting cabinets is not expensive but it adds up and adds time to turns if you scale to more properties.

We used a bit of a darker color here which seems to hide the wall imperfections a bit more.

actual possession leaving no doubt that YOU are in possession of the property.2. constructive possession, having some "color of title" meaning that you have some paper however imperfect showing some interest in the property.3. 

Repaint, refinish floors, update aesthetics, fix imperfections/wear and tear, new appliances and landscaping.

Will they flex to conform to the imperfections of the existing floor or do they strain at the seams and pop?

It may hide imperfections but the first time you have to scrub anything off of your wall, the paint will come off with it.