Compatibility with other platforms (Specificatlly NinjaTrader) for copy trading

I assume that many traders here also trade with multiple prop firms. As such ability to connect to NinjaTrader whether it be with an existing connection service (NinjaTrader, Tradovate, Rithmic) or integrate a specific one with NinjaTrader, would allow us to easily trade with all our accounts at the same time and enter trades on all platforms from a single interface, instead of multiple interfaces.