Exactly! Didn't we had big discussions in this forum about the first line of SXT's that when they were fit in old style, single-chain V-pol omni antenna networks we had to hang them on their sides. Water ingress, odd fitting etc.
So from these days indeed Vertical was chain 1. Why they now use chain '0' in a manual is a sign they themselves are not always knowing what they are doing...
But anyway, as long as you make sure both ends of the link are the same you should be fine.
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Rudy R. Puister
WISP operator based on MT routerboard & ROS.