So a seated person can see themselves.

A vertical mirror serves a standing adult.

A wheelchair user sees the ceiling.

So does a child.

Tilting sweeps the view downward.

Because that fails the standing user.

It moves the problem rather than solving it.

In a shared washroom that is no answer.

A tilted mirror serves both.

From one position on the wall.

The angle drifting under its own weight.

Or being pushed and left wrong.

A mirror that will not hold its angle.

Ends up serving nobody at all.

Which is worse than a fixed one.

Fixed, in most public installations.

It is set once and cannot be interfered with.

Adjustable suits a single household user.

Who may want it different at times.

Match it to who uses the room.

The floor and the lower opposite wall.

As well as the person in front of it.

The steeper the angle, the lower it looks.

In a small room that can be the WC.

Rather than the user.

From a seated position, by looking.

Not calculated from a drawing.

Sit where somebody will actually sit.

And check what the glass shows.

Then fix it there.

Yes, because the load is not flat.

A tilted mirror hangs away from the wall.

So the top fixings take a pull.

Rather than only shear.

Use the bracket supplied with it.