Inside mount because that is better. Price figuring mounting into wood. Required in bedrooms and is not a key because it is dangerous. Foot pedal only. Other bars not in bedroom are releasable with key.
All windows come with a keyed padlock so no release system is needed.
Keyed release, keep key nearby window. Key with padlock on inside. No release system available. Once mounted they are stationary . When asked about getting out in case of a fire, No way out, sorry.