You have to be careful not to implement conflicting routes and subnets when connecting to multiple OpenVPN servers at the same time.

This program does support connecting to multiple OpenVPN servers at the same time, but there is a catch. Server-locked profiles are not supported, as mentioned earlier. The tray menu in the system tray will then show you options to use this connection profile – to start or stop the connection. You can for example download a user-locked or an auto-login profile from the OpenVPN Access Server web interface, and drag and drop it on the Tunnelblick icon. This program supports drag and drop to place OpenVPN connection profiles into Tunnelblick.

This is accomplished on the Connect Client with a universal server-locked profile which is not supported by the OpenVPN GUI program. On the other hand, it does miss some features that Connect Client does have as well like Python support for post-auth scripting and other functions that integrate Connect Client with Access Server, like the ability to import connection profiles directly from an Access Server, or the ability to authenticate any valid user on your Access Server and have them connect without having to install a connection profile for each separate user account. It is called Tunnelblick and it is less limited in functionality than the OpenVPN Connect Client because it does support the option to connect to multiple OpenVPN servers at the same time. The open source project has a client for the macOS operating system as well.

I find the feature comparison from the OpenVPN website quite helpful: Alternative: OpenVPN open source Tunnelblick program

How to use tunnelblick