What should be placed in front of the main door?
As a questioner in the field of cryptocurrency and finance, I might ask: "In the context of enhancing security and privacy for a cryptocurrency exchange or financial institution, what items or systems should ideally be placed in front of the main door to ensure the highest level of protection for both physical and digital assets? Are there any specific security protocols or technologies that are particularly effective in this regard, and how do they contribute to a comprehensive security strategy?