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Peter,
Unless you have a very large OTA that might require clearance considerations, the best spot is to position the intersection point of your mounts Dec and RA axis at the centre of the dome.
That usually means there will be some slight offset of the centre of the pier to the centre of the dome. But it may not be great.
If the OTA is small then it becomes less relevant as the slit will always be wide enough !
If you are automating the dome, the dome controller software will automatically calculate any dome slit offsets to counter the RA movement of the equatorial mount about the centre of the pier. The larger the OTA is with respect tot he dome slit - the more this matters.
Rally
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