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All software should respect my OS-level locale settings - unless there's a very good reason.
(Edit: now I'm not sure if any OSs include physical units in locale... 😬)
(Edit 2: and there are good reasons to work in the actual units used to define physical output anyway - as I found when I used to do work for output in the US)
You want 'Poster' settings in Acrobat Reader print dialog.
Not sure about other PDF tools. Your printer might be able to do this via its driver/utilities software too.
(Image shows an A4 design being scaled up to print on 4 × A4. One day I'll work out why it's measuring in inches 🙄)
Edit: for your purpose, a lot more generous overlap may help alignment