Re: Can't place shower and I don't know why
@jupkmn I meant the door on the shower itself, as in, the way the sims enter and exit the shower. I was suggesting making sure that shower door pointed away from the three walls.
If that doesn't work, try taking all the other objects out of the bathroom and deleting the wall, then placing the shower and making sure the sims step in and out of it in the direction you want. Rotate as necessary, then add the other objects.
It's also possible that this shower simply needs more room than you're giving it, but I don't know for sure. You could experiment with building on a different lot or trying a different shower, or maybe someone else who's used to building in tight spaces will see this thread and recognize the problem.