As a direct result of the business that I was involved in, I had to learn and learn fast because all the places I had to be had poor coverage in that time. (It is better now.)
After I struggled, I found out about
Wilson Electronics and bought the kit from them. Actually, the first of three. So, go there and and study up. Then, when you have made a decision, jump in with both feet. At that point, whether you use a Hot Spot device or your own phone (what I have done most) is completely your choice. My phones have always managed to support both may wife and I no at the same time. As the current repeater is a cradle type, it only manages a single device at one time.
Why have I had three??
The first was basic cell.
The second was for 3G.
Now we are at 4G. And every major change was also a band change as will also happen with 5G.
With the repeater (booster) in the coach, it didn't matter where I was, I could reach suppliers and clients (the people that wanted to pay me) could reach me.
The real surprise was when we finally actually used that coach for a vacation. At that time, it was published that there was a dead area between Amarillo and Albuquerque along I-40 and we never saw it.
We have also since (now retired) lots of places that others did not have success, but we did.
Matt