Many more recent bt headphones support multipoint, but I'm not sure any support more than two simultaneous connections. This meant I was back to disabling Bluetooth on my tablet when I wanted to use the Jabra 85hs to the TV.
And I was naive enough to think that the sound from the two connections would be mixed, so you could, for example listen to music on my phone while hearing audible notifications from the computer (without the music dropping out).
As with anything BT, it's a mixed bag. That said, after resisting it for a long time, those Jabras were one of the best things I ever bought.
https://www.soundguys.com/bluetooth-multipoint-explained-286...