I've installed bull's-eye levels on all my field cameras that came without levels. They work just great, especially if one takes a bit of time to level the camera and then install the level (double stick tape or glue) so that it reads level when the camera is level... you get the idea.
As for reading it. I find the bull's-eye levels easy to read at eye level looking in from the sides. I look at the level from the back of the camera to level from side to side and then again from the side when leveling fore and aft. It's just as easy to read the levels this way as looking straight down on them (if not more so since I can adjust just one axis at a time without confusion).
For architectural work, however, final leveling is always done with the grid on the ground glass; the camera might be level, but the rest of the world rarely is
Best,
Doremus
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