In a prior life, I ran a company that owned a distributor of cellular phones and equipment, including all the major brands of boosters. I still follow that closely for a variety of reasons. Right now, I would recommend either the SmoothTalker boosters or PepLink PepWave routers and antennas. I'm assuming better data rates are your objective? Where and how will you be using the boat? In a whole bunch of areas, coverage has gotten so good, a booster is no longer a necessity. Plus installation integrity is a critical factor for boosters.
"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"