It seems to be a nice 150W-8ohm/225W-4ohm x2Ch amp if you need 2 more amps for a total of 11Ch.
The RX-A3080 can output about 190Wx2Ch 8ohm and 300Wx2Ch 4ohm.
Adding any external amp can relieve some burden - if the A3080 needs it.
But most often, it doesn't need it and adding external amps won't improve anything.