Do you have a Headphone Jack on your TV?
Connect a Bluetooth transmitter to this
Then us a Bluetooth Amp to power the speakers.
I have a 12v Nobsound NS10 pro bluetooth amp rated at 100w [I tested it to 7.5a draw x 12v = 90w]
My bluetooth Amp is powered by a 12v x 8a computer AC adaptor that has been running 24/7 for 5 years.
Between the AC adaptor and the Amp I used a 12v remote relay to switch it on and off.
Here is the bluetooth amp [I have 3 in my house and one in my 57 Chevy]
They cost me $25 each from Ali-Express
Testing the setup
This is the 12v 8a Computer AC adaptor hidden in a junk cupboard in my kitchen
The Barrel plug goes up into the ceiling crawl space and splits off to 2 Amps
Here is the bluetooth amp with the remote relay hidden under my curtain valances [this can be in the ceiling if needed]
I use a "key fob" to switch it on/off remotely
This is one of the 4 speakers [2 rooms, 2 amps with 2 speakers each]
They were from a Sony Home Theatre system that blew the output IC when the carpet layers short circuited the speaker wires
I made alloy brackets ,laid them sideways and screwed them to the curtain valance framework
This is the overall effect I wanted which is hidden but with a reasonable sound quality [I am not an Audiophile]
It is all behind the curtain valances
I also paired my phone to this amp [when watching TV I need to switch off bluetooth on my phone]
With the TV off there is no signal so it automatically pairs to my phone.
Because I already had the speckers and AC adaptor I am into the whole setup for less than $120 for 2 rooms
That's 2 amps ,2 relays, all the barrel plugs and wall fittings and wire.