You can 'hide' your real stops by how you code your EAs. For example, your EA can manage the stops in the background and will not submit the stop loss order until the price actually exceeds those thresholds. In this way, the broker won't be able to see the stop loss price level until you submit it. There are also 3rd-party EAs that will help you manage the same.
The challenge is if any of those Builder-generated strategies submits a stop-loss order, along with the buy order, to the broker, the broker could use that information to take you out at that stop loss price level. I have not looked at Builder's MT code that closely to see how the stop losses orders are managed / placed, so this may or may not be an issue depending on the strategy.