Cell boost will definitely boost signal bars. As for speed, there’s 50/50 chance it will work. There are some factors that can affect speed since the smarthub is wireless device (LTE tower congestion, wifi interference, wifi congestion, wifi signal etc). Also not sure if it matters to you, cell boost adds extra hop (adds latency).
It is possible the reduction in speed is due to increasing subscriptions to the cell tower, and if so, a booster won’t help.
The Source lists cellular boosters on their website.
Also,if I recall Wilson is a well respected manufacturer.
Another spam post. Copied from https://forum.telus.com/t5/Internet-Home-Phone/Rural-Smart-Hub-and-cell-booster/m-p/107408