Is there any other way to set IP address restrictions?

I am subscribed to the Business Plus plan.
I would like to set restrictions on global IP addresses, but from what I have researched, it seems the only way to do this is by issuing a ticket through this support form and requesting the settings from support.

Is there any other way to set IP address restrictions?

Since I use this for business purposes, mistakes in the settings are not acceptable, and due to the time difference between Japan and support (West Coast?),
it is absolutely necessary to avoid any situation where access is unavailable for several days. If there is a flexible way to set IP address restrictions other than contacting support through the form, please let me know.