This one appears to be a better deal for my situation. I can just buy GB that don't expire for $8 each which is comparable to most mobile plans that require contracts. No monthlies. They have other plans that may make more sense for extended outages. It also functions as a power bank. They also have a $9 "unlimited wifi" for $9/24hours but I don't immediately see what "unlimited" means.
https://www.amazon.com/gp/product/B08YKB6VMN?ie=UTF8&psc=1&linkCode=ll1&tag=fb0c6d-20&linkId=1cc4a2e751466a51d19244c442604309&language=en_US&ref_=as_li_ss_tl
Updated that "unlimited" means subject to their "Fair Use Policy" meaning speeds might be throttled. If want unthrottled speed, buy per GB.
https://www.amazon.com/gp/product/B08YKB6VMN?ie=UTF8&psc=1&linkCode=ll1&tag=fb0c6d-20&linkId=1cc4a2e751466a51d19244c442604309&language=en_US&ref_=as_li_ss_tl
Updated that "unlimited" means subject to their "Fair Use Policy" meaning speeds might be throttled. If want unthrottled speed, buy per GB.