This is what Allure has on the top of the desk/vanity area, and below the counter, in our Balcony cabin.
We purchased this a while back:
https://www.amazon.com/gp/product/B072K5ZJXF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
It shows unavailable now, but they have tons of different ones out there. This one has a usb c for new ipads, and regular usb. Only uses one outlet , and can charge multiple devices at once.
Don't bring a surge protector. They might take it due to a fire hazard.
If you like Martinis, may I suggest Champagne Bar. It was our favorite spot, especially for pre-dinner drinks. It's been replaced on the newer ships by the bionic bar, and we definitely miss Champagne's!
Enjoy your cruise. Allure is a beautiful ship and so much fun!