I called up RCL, and told them the make and models of the bricks I bring...
After being on hold, and getting a call back from them 10 minutes later (for research), it was determined that those items were not in violation.
Here are the items:
Cruise Approved Power Strip Non Surge with USB-C, USB & 3 Standard Outlet Plugs - Cruise Essentials for Carnival, Royal Caribbean & All Cruise Ships
Anker USB C Outlet Extender, 321 Outlet Extender With 3 Outlets and 20W USB C Charging
Anker European Travel, PowerExtend USB Plug International Power Adapter