Bluetooth audio onstage will lead to dropouts with lots of people in the room. During rehearsals it is fine, but please don't use it directly in a venue. If you absolutely need wireless, then AirPlay on a dedicated strong Wifi network can be stable but has high latency of up to 2 seconds.
The gold standard is a wired connection. If you are worried about damaged cables, just run your 3.5mm cable to a DI box and then use standard microphone cables to the mixer.