A:AnswerI have a POLK Signa S2 as well (great sound). Use Optical Digital Out for the POLK. Use HDMI 1 (eARC) for DirecTV, and HDMI 2 for Firestick. I am certain that you would get the TV's audio out signal from its Optical output regardless of what Audio Output is selected on the TV. If you do not get the audio, then switch the TV's audio output to Optical.
A:AnswerEven though the box and the manual state you can use Alexa - you really cannot
There is a workaround with the Smartthings app but this is a lie from Samsung where it shows on the box and in the manual that it states you can use Alexa
You cannot use Alexa with this TV. Samsung lied
A:AnswerYes this Samsung mounts to the wall using the appropriate bracket and hardware. Make sure you anchor the bracket into the Wall STUD using a stud finder.