Stealth Audio Speaker selection help

[cknaak]

I'm doing a stealth audio install in my 911 hot rod(no head unit and no visible speakers).

For the build I'll be using a 2 channel bluetooth amplifier from Out of Sight Audio and hiding the speakers and amp in my rear seat delete luggage shelf.

I would like some recommendations on what size, model, features I should be looking at for the best quality sound given my scenario. I can pretty much use any size speaker but will be limited to only two for 100%of the sound.

I'm obviously not looking for an audiophile level system but would like it to sound decent for long drives. Thanks for the input!