Interesting you should bring up the vents. My platform had plenty (see photo above) and it was ripped off from stern to 3-4' tied to dock.
There is a fellow around here who makes custom platforms w/o vents. He also encapsulates the brackets so there is no exposed metal and, therefore, no electrolysis. I've seen the work, and it's good. Owners swear by them. Boatyard owner has one on his boat and swears by it.