You'll probably find the cheaper domes are 2 axis where as the more expensive ones are 3 axis (allows you to twist the lens as well) This will be required if the camera is mounted on a vertical surface but rather than looing directly out and down you'll also be looking across at an angle. Without the 3rd axis adjustment the image will be skewed (or sideways even). You can get away with 2 axis but you'll need to twist the whole dome to get the picture straight and them mount it to the wall last one you've eyed the image up (not easy or ideal)
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