How can I make correct enclosure and use PoE for Indoor Hotspot ?

If you need to make same and use only 1 Cable to take Internet and Power till Hotspot, you will need at least two more additional device, PoE Injector and PoE Splitter.
There are 2 Options to make Antenna connection, 1st one is recommended as you use less cable and connectors so less Dbi Loss. 
In this scenario we used RAK, only difference is on Power side, you will need Splitter with USB C Connector.

We recommend to use good quality devices as every device you add Means “More Point of failure”

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