My recommendation would be to not waste your money. While boosters do work, the wifi they bring in is often not usable, especially for streaming with firesticks. Wifi Camp Pro has good reviews and I was considering it when researching solutions, but I eventually decided to go with a NetGear Nighthawk router on an AT&T unlimited plan and forget about any campground wifi. TechnoRV has a Wifi Camp Pro 2 open box special right now for $89.00. That's less than half what I was looking at last year.
https://www.technorv.com/wifi-camp-pro-2-kit-open-box/
If you're sure the wifi where you're going is good to go, it may be worth the money with the discounted price.