The water will be contained if the prefab is installed correctly. I’d personally do a Corian over an acrylic one. It’s a renewable surface and can be sanded to look like new.

But if you have concerns about tenants, waterproof the floor under the tile too. It’s cheap enough for the belt and suspenders approach for a rental.

And a shower curtain for sure. Get a several hotel heavy ones and put them in the closet so there’s always one in stock when the grommets rip or it gets gross.

We took our grungy shower door off last fall in preparation for a remodel to see how a shower curtain would work out. We've had no water escape to the floor and the adjacent drywall hasn't gotten wet. Plans for the remodel are a Kohler cast iron shower pan with tiled walls. We'll tile to the ceiling in case we ever want to add a door, but I don't see that happening. We use a curtain and a polyester liner.

This is the only photo I've found on Houzz. Wood floors!

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As someone who rented for many, many years, I would have tossed any shower curtain that was already in the unit when I moved in. Ick. At least in my part of the world it was totally expected that the tenant would provide their own curtain, same as their own towels and sheets.

Are there occupants underneath this unit? If so, I would think twice about using a shower curtsin that if not properly set, could send water out of the pan. These other folks have some great ideas to help with that though.

I have rental units and would never, ever consider a glass door for the reasons you are concerned about. I also toss shower curtains because no one wants anyone else's used one, new tenants want to decorate in their own style, and I don't have time to wash them in-between tenants. However, prefab showers are a nightmare with shower curtains. The curb is never high enough to contain the curtain properly unless the user takes care to make sure it's positioned correctly, which is iffy at best. Tubs have the same problem, believe it or not, albeit at a smaller rate. And tenants never accept or believe that the water coming through the ceiling below is due to their misuse of the shower curtain. Now I tile the wall outside every bathtub and shower, including waterproofing the wall, and also waterproof the floor several feet out. And when I replace a shower, I always put in tile pans so that I can build a sufficiently high curb to properly hold the curtain in. I also try to put in wing walls if possible so that the curtain rod can go all the way across the shower and past the opening by at least 6" on each side. That way the curtain is totally inside the shower along the bottom and both sides, with no opening for a tenant to have to fuss with.

The unit is the lower level so if it leaks its leaking into the basement. In our bathroom we have a swanstone base in the shower which has worked out fine. I don't know if the swanstone base can be refreshed like a corian one can. Cost is certainly a concern here but I will check out corian or swanstone bases.

Buying quality weighted shower liners is certainly something I would be willing to do and would always put in a new one with each tenant. I could give it in the package so they know it's brand new.

In our own other bathroom we have a washable liner that has lasted many years but a few times with that tub/shower combo the curtain didn't stay in place and the bathroom was flooded. I had to keep reminding the kids for a while to make sure the curtain was in place.

For the floor we are thinking of tile.

"I had to keep reminding the kids for a while to make sure the curtain was in place."

Exactly! You have to do the same thing with tenants, but you can't, because you're not there every day and you're not their mother! 99.9% of tenants do not treat their home the same way they would if they owned it. I'm sure you don't have a problem with your shower base, but I'm just as sure that a tenant would not be careful with the curtain. And the leaking problem isn't just that the water goes to the floor below, it also wicks up the walls. Which is why I waterproof and tile all walls adjacent to tubs and showers.

Catbuilder has an interesting idea with the wing walls, which creates a little bit of an alcove, but I think you'd need a tiled shower pan to do that. Does anyone have photos of this idea?

You mention that the glass door would make it appear more open. You'll save over a thousand dollars by omitting the door and some of that could go to a decorative tile or a tiled niche and then the tenant can leave the curtain pulled back. You only have to provide the polyester liner, which the tenant can wash or replace. They can add a decorative outer curtain if they prefer.

Our liner does stay within the curb of a standard one-piece acrylic
shower surround. The shower spray is really not that powerful that water
splashes enough to escape.