We are currently redisigning the user interface which will make adding multiple cameras much easier. Not quite like a spreadsheet, but overall a much more efficient design.
This is already possible locally: set the Browser to multi-file mode (in the Browser settings), then select multiple cameras to view their video synchronised together.
This is currently not possible remotely, but we're looking into this.
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This is currently not possible remotely, but we're looking into this.