Three Frame Questions

Hi all. Kayaker new to rafting here, setting up my first oar rig, an Otter 142 with NRS Compact Outfitter 3-bay frame (60" x 78"). I plan to run it loaded on multi-days with two passengers up front and also solo on day trips, ideally with the same frame. I have three related newbie questions about frame measurements that I didn't quite answer in my forum searching.

1. How important is it to have the oar towers set in the middle of the raft's water line, and does this preference change when...

Three Frame Questions