MinRole Topology question

Hello,

We are upgrading to sharepoint server 2019 from sharepoint server 2010.

In the new 2019 environment we planned for 5 sharepoint servers plus one sql server.

Out of 5 servers 4 servers will be internal and 1 server is in DMZ for external sites.

For implementing MinRole topology we are thinking

4 internal servers -  2 servers with shared role (Frontend with Distributed Cache) and 2 servers with shared role (application with search).

1 external server with custom role with all the services running on it.

Is that a good? please let me know.

rani