My older Epson 8350 projector has a feature they call "Lens shift." When setting it up you make sure that it is perpendicular to the screen surface. Then it has two mechanical adjustments to vertically and horizontally shift the image. Page 25 of this user manual shows that it can shift the image vertically up to one image height up or down. And horizontally up to one half image width either way. It makes setup a lot more flexible. I'm not sure how common the feature is though on newer more available projectors.https://files.support.epson.com/pdf/plhc87u/plhc87uug.pdf
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