I received a response from CALB in regards tot their CA cell and orientation.
"The reason why our cell can't mounted horizontally lies in the structure of the cell. Our rectangle cell choose lamination structure and lay horizonally would result in short circuit. If you insist on achieve this, you can choose pouch cell or round cell.
This is completely different than a response I got from them a while ago... the response I got was that they could be mounted horizontally without a problem. Only upside down is 'forbidden'.