If cTrader provides a FIX interface, you can theoretically Zorro connect to it through the broker plugin. But this is not a fast solution, since all quotes and orders then run through cTrader.

It's the same with the MT4 bridge. The latency is in the ~10 ms range. For a fast connection you need to connect Zorro directly to the broker - a cTrader or MT4 connection won't do. But if speed is not very important, it's a convenient solution.