Is there any reason you can't just use a shifting spanner, fixed wrench or socket wrench?
You sort of have to... but that's often not a very tower-friendly solution. Keep in mind that half the time, the nut is on the far side of the unit from you, where you can't see it. On some of these mounts, you can't even use a socket because there isn't enough room for the socket wall, and you can't use a nut driver because the bolt extends too far out. There's no good reason for not designing these joints to industry standard tolerances.