There are two easy ways to align HiLO Lens. Now for a demonstration…

Firstly the shape of HiLO Lens matches the curved profile of the iPhone. So you can align it using this curve e.g.

Secondly we can see the camera iris when looking into HiLO Lens. The HiLO Lens prototype is not well aligned in the image below.

Below we can see that the HiLO Lens prototype is well aligned.

It is surprisingly easy to align when you are used to doing it.