@Waakhond you are Dutch ?
I got the same problem , height is between instructions so that’s fine and indeed in the app cameras are “on” but looks like they turn of somehow.
The thing that worked is turning them off and on again and they work again for some period…
The problem is you don’t know for how long.
So now I’m checking before I go to bed if they work and when I leave also.
Otherwise you simply don’t know it . But you buy them for security notto check them every time.
For me it doesn’t matter wich camera ,both stop…
I don’t think eufy looks here for these things , I contacted them they asked me some info and I. Hoping they come with a solution.
The strange thing is Looks like ther cameras with problems are the newest firmware