As j garcia indicated, you can's use a Rocketfish because it already has its own amplifiers built-in. If you intend to use an outboard amplifier,
this is probably one of the best units of its type on the market, at least as far as reliability goes. You’ll need two of them - one to transmit and one to receive.
As far as benefit, the only thing is no wires. For that you get unknown audio specifications, and the possibility of interference from other Bluetooth devices you may have. Also, there could be noise issues of your surround speakers are super efficient.
Regards,
Wayne A. Pflughaupt