How to organize a home wireless speaker system?

Question

Bluetooth

There is a tablet with Play Google Music. There is an apartment, in different corners of which I want to put small speakers that synchronously reproduce the stream from the tablet. The maximum distance of speakers from each other is 15 meters and 2 concrete walls. The tablet will hang somewhere in the middle and will only be used as a music center. I don't want to run cables all over my house. Tell me, is it possible to organize such a speaker system based on Bluetooth or other wireless technology? Advise what speakers would be optimal for this?
Sound quality requirements are not high. There are no music lovers in the house, so sound distortion through the air is not a problem. I just want pleasant music around the house to hum in the background.

Answer 1

In addition to Andrey Khokhlov 's answer , here are absolutely wonderful acoustics:
JBL Control 2.4G AW
, although considering that the requirements for sound quality are not very high, this may be too much, especially considering the price.
Connecting several BTs may be solved by software.