Yup, what yzer said, except I'll add "tie a safety lanyard to them" as those suction cups suc, or should I say "don't suc very well".
I use the pole mount on my inflateable's transom (white light), always at the ready, and add the red/green for extended night cruising (differs from my dock to mooring run). I run 3 strings around the suction cup of the bow light and tie it off to the port, starb, and forward bow rings.
I put one of those suction cups on the top of my outboard once, about 10 minutes later it was gone, engine vibes and suction cups don't mix well........