I'm in Methuen/Charlestown during the week and on the Cape on the weekends. One of my best buddies/fishing buds is from East Bridgewater.
If the rail mounts work well, which they should, it is the easiest way to go.
I see the Seasucker stuff, it is nice, but really too much money for me. I needed something for my 3 oz pyramid sinkers and went to Bed Bath and Beyond and got an OXO soap tray with a suction cup mount and for $7, it has worked out well.
If you ever decide you want to mount some rodholders, just let me know as I have the hole saws and would be willing to help you out, here are the 5 I have sunk in my gunwales this past year;