I've seen similar topics but nothing specifically mentioning this configuration. Here's what I want to do.
1. Take my TCL Atmos 9i and connect it to my TCL Roku TV using the optical or HDMI connection.
2. Connect my Wireless Roku Speakers to my TCL Roku TV via Bluetooth.
I would like to use the Soundbar as front speakers and the Roku Wireless as rear speakers.
Roku wireless speakers don't use bluetooth, no bluetooth speaker or headphone can be paired to ANY roku device directly. Roku are bluetooth receivers only, just like bluetooth speakers and headphones each has to have transmitter to communicate with, which none are.
If you have Roku tv, then the Roku wireless speakers paired to it would be the mains, they use wifi-direct to communicate not bluetooth. Then the TCL soundbar once paired to the roku tv will be the center channel.