Best system for wireless monitoring
 

Good morning
I have a project involving live musical setup on a lake in Italy. It will be played on the lake, there is no need for heavy wattage.
The instruments are:
-voice
-electric guitar
-percussions
I will be using a couple of Bose S1 Pro but I’m concerning about the latency given by Bluetooth protocol. I cannot use a wired setup.
I hope someone can help me overcome that issue.