Stop Limit is an advanced order type. It is a limit order with an additional trigger (stop) price. This order is hidden from the order book until the market price passes the trigger (stop) price in the order.
Use this order type to prevent your position from getting liquidated.
DISCLAIMER: The STOP-LIMIT order is stored and triggered from the DMEX server. Opening a STOP-LIMIT order implies trusting that DMEX will trigger the order as expected.
STOP-LIMIT orders are triggered by the price on DMEX, not the mark price.