No, you do not need WiFi in all areas of your property to use StratIS.
You will need access to WiFi from the StratIS tablet to perform operations which are typically done in an Office setting (writing keys, adding residents, etc.). This ensures that we can securely create credentials for your site and can lock out a tablet from creating keys if it is stolen.
WiFi is not required when programming doors. You have to download the Door Files when you have WiFi access, but then you can tour the property and perform door programming, retrieving audits, and all other operations requiring a physical connection to the lock without internet or WiFi access.