Launching two applications at the same time is not the best idea. As they will not work correctly.
It is better to use them one by one. For example, if you use Safari, it is better to enable AdGuardPremium.
If you need to block ads in applications, you switch to AdGuard PRO.
As for cruise ship Wi/Fi, it's hard to tell if it will work right away. VPN is created locally on the device, so it is possible that your access will not be blocked.