I use this USB hub from Amazon so I can use 4 controller on boomerang fu. And I keep my lights how USB there. Push the button to turn each one on https://a.co/d/55vj7Vt also I use they wired . https://a.co/d/4aUxC0H some times the button are off but they work. You are limited to two Bluetooth controller and I have to disconnect my phone.My setup is this...
I got this for the glove box to allow for more usb ports. Plug the memory stick for security into blue and other three can be used for Bluetooth controllers or whatever else you need. The one thing to not is that it might need a little tape to keep the usb plug and body perpendicular. It doesn't want to stay in line and the hub drops down into the tray of the glove box which makes it get caught on things in there. It's a minor fix.
https://a.co/d/bkgA4Zp
For the controllers, I went with this one. We use Xbox at home so wanted something similar. You plug in the Bluetooth dongles into the USB hub and 2 controller can be used together. I went this way because the CT can only connect to 2 BT items at once, so for 2 people in the back to play, my phone has to not be connected. This way I can keep my phone connected and have2 play in the back. Both come with a charging cord that I plugged into the back.
https://a.co/d/06ikX3a
And you still have a USB c slot in the glove for whatever else you want.
I wondered how to get 4 controllers to work. Now I just need to find a storage solution for 4 controllers.I use this USB hub from Amazon so I can use 4 controller on boomerang fu. And I keep my lights how USB there. Push the button to turn each one on https://a.co/d/55vj7Vt also I use they wired . https://a.co/d/4aUxC0H some times the button are off but they work. You are limited to two Bluetooth controller and I have to disconnect my phone.