Can I place SkyConnect close to Bluetooth-Dongle?

Zigbee, Thread, and Bluetooth Low Energy (BLE) all uses similar low-energy radio technology on the same frequency range so they might interfere with each other, as they are all extremely sensitive to EMF/EMI/RMI interference and have very short range and poor penetration, so personally I would not risk it. If it works it works but if you run into problems then before you troubleshoot any deeper you really need to start taking active actions to follow the best practices, read and try to follow all the tips here → Zigbee networks: how to guide for avoiding interference and optimize for getting better range + coverage (where many of the tips there really apply to Zigbee, Thread, and Bluetooth Low Energy since all are use similar low-energy radio technology on the same frequency range).

+1 on using a powered USB 2.0 hub (not USB 3.x or USB 3.x), and another tip is to use a USB RJ45 Extender kit to convert a shielded Cat6 Ethernet cable or better, into a very long USB extension cable, see example https://www.amazon.com/Cat6,SNLLMZI-Extender-Extension-Connector-Adapter/dp/B08FMLGNQN/

Recommend connecting the powered USB 2.0 hub via a such long extension cable.

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