A:AnswerYes it will work to enhance the cellular side of the hotspot but it does not enhance the WiFi signal. For WiFi you’ll want a bigger WiFi antennae or a powered one.
A:AnswerCheck the specs on the specific one you get generally all 3 currently come with about 4 meters or 12 feet of cord. Some versions are a little longer than others. Check the specs on the one that you choose and you can always swap out one of the two cords to add/reduce length. They are easily obtainable std type connectors.