polk mm651UM JL M650 Wet Sounds XS-650

Have a 2013 Cypress Cay Pontoon Can ski wake board, ski off the back etc.. off the back.
The 300 HP engine is very quiet but you have wind and water noise.

Looking to redo the 2 rear firing speakers as shown on the photos. Want to be able to hear the music without adding tower pods. (just basically replace the speakers shown on the rear).
The 3 I have heard a lot about:

Polk MM651UM 4 ohm
Polk MM651 (removable grill) 2.7 ohm
JL M650 (not sure if grill is removable) 4 ohm
Wet Sounds XS-650 4 ohm

I want to run these at 150 RMS for about 3 hours at a time. Any recommendations on which speakers and which amps match up well to these. Only looking at 1 pair of speakers right now and 1 amp.

Note on grills: I also can get stainless steel grills that match the rest of the inside the boat that allow the tweeter section to come thru (See attachment 4 which I can put on the back). I don't think the Polk MM651UM allows removal of the grill but the Polk MM651 does allow grill removing I don't have to use the factory grills. I can also just use the grills that are attached to the speaker although the JL grills on the back of this boat I think would look pretty ugly.

Any input greatly appreciated