Who is your current provider? If not on their top tier plan, you may want to upgrade to that plan for just the month and then "downsize" after you return.
ATT is my provider and we have 15GB of hotspot data on each of our 3 phones. Does well for most of trips with our boys tablets. If cinamatic movies are watched from streaming services, we can use the android phones to cast the movies to anyone of our TVs by way of a type c to HDMI adapter. This doesn't dip into the hotspot data and we don't get throttled even going over or 50GB limit on each phone.
If trips are far and few between, it may not be worth investing in a service plan with another provider along with buying the equipment.
Personally, our 3 boys are usually "done in" after dinner or an evening campfire as their day is full of non-stop activities. They fall asleep hard many times during evening movies so we rarely need them. Plus, we're camping...nuff said.