Trailing stops are now available for perp markets.

A trailing stop's trigger price follows the mark price as it moves in favor of the position. When the mark price retraces from its best level by the selected distance or percentage, it triggers a market order for the selected size. For long positions, the trigger price follows the highest mark price reached since activation; for short positions, it follows the lowest. An optional activation price determines when tracking begins. Without one, tracking begins immediately at the current mark price.

See the Support Docs for more.