Easy way to restrict access via IP filtering from outside the Netherlands

We have developed an app for the Netherlands and want to restrict access to the rest of the world for security reasons. I have found the way to restrict IP addresses access in the docs. However, the IP ranges from the Netherlands are not an easy range to enter and maintain. Is there an easier way to restrict anonymous access to the app from outside the The Netherlands? I did not find a suitable module in the Marketplace.   Thank you in advance
1 answers

Maybe Cloudflare could offer a solution for this, never used it but might be worth looking into.