The shower head in the picture is a bit unusual because of the two screws on the right where you can adjust the head. If you loosen the one next to the wall the shower head tilts down and faces the wall (which is nice if warm water takes a while and you don’t like a cold shower) and with the other one you could make it spray the opposite wall.
So it’s pretty versatile. (Or annoying if the screws can’t be tightened enough)
I think he means that it’s permanently mounted there, unlike the ones you can take off the wall and move around.
The shower head in the picture is a bit unusual because of the two screws on the right where you can adjust the head. If you loosen the one next to the wall the shower head tilts down and faces the wall (which is nice if warm water takes a while and you don’t like a cold shower) and with the other one you could make it spray the opposite wall. So it’s pretty versatile. (Or annoying if the screws can’t be tightened enough)