Looking for some suggestions, I just bought a set of 2 of the Millennium rod holders, I want to put 2 bases at the back and 2 at the front of my xpress jon boat. At the front there is no issue, I can reach through the anchor locker and put washers and locknuts on bolts, On the back where I want to mount them has no under access. It is just a flat deck, with some foam underneath I believe. There is a small hole, not big enough to put 4 nuts on the back of all the bolts. I have the screws they sent, but I plan on using them for catfishing off the back, so they need to be fairly sturdy.
Has anyone mounted them with the screws? Or would you cut a small access hole and just bolt them and look for something to plug the holes?

The rod holders are built very well, I like them so far