LTE Amplifiers/Google Fi for Med Cruising

[NausetSailor]

We're planning on cruising the Med next summer and am looking for an LTE amplifier that works with common European carriers services Med coastal areas (similar to a WeBoost Drive Reach used in North America). Would love any recommendations on products to use/avoid.

We're also looking at a Google Fi Unlimited subscription which provides unlimited data (throttled after 22Gb) and texts and calls to 50+ countries.
Curious if anyone's had any experience with this service.