I'm going to disagree, do any of the guys saying no rear facing tower lights actually have them? We run a Roswell 6 light bar and can turn them forward, down, backward, wherever and they're super nice for coming into the dock late and also useful for surfing at night and cleaning the boat up in the dark. How often are you staring at the tower while you're surfing? Yeah they're bright if you're going to stare right into them but we're able to surf just fine with the lights pointing down into the wake and into the boat. Lights everything up really well.
That said, surfing at night and having bright tower lights on at night is not going to get smiles from lake cops. I live on a very quiet, small lake without much regulation and no enforcement.
The roswell bar comes in a 2,3,4 and 6 light setup too and mounts with clamps.
https://roswellmarine.com/boatlighting.php