I telecommute, (taxes and accounting) I rely 100% on the internet for my US phone, e-fax, and all email correspondences. I have a basic Kolbi line at the apartment and use the costa phone's hot spot option, as a back up. my third back up is the free wi-fi in the apartment complex .
In the morning the internet is great, but it steadily degrades during the day, and picks back up about 11:00 PM
For your needs, sounds like you need their top plans.
Here is the web site showing the choices
https://kolbi.cr/wps/portal/kolbi_dev/h ... BIS9nQSEh/