How to install surface mount box under eave with aluminum covering

Question

I want to install a flood light under the eave of my house. I ran the electric from the basement through 2 floors to the third floor attic and into the eave already. I bought the flood light and a round surface mount box.
I asked a guy at Home Depot about the install and showed him this pic I took:

He seemed to know what he was talking about, but didn't mention anything about the eave covering. I then looked up how to do the install on YouTube when I got home and the first video I saw said to not install when the eave has a ridged covering with channels for airflow, which is what it looks like I have. The claim was that this could cause water to get into the box:
https://youtu.be/SQxaWKmGbIw
Should I abandon this little project or can I like, cut a hole in the either aluminum (or vinyl? - I'm guessing aluminum because that's what the garage has) covering to mount the electrical box?
This is the type of box I got:

Round Bronze Weatherproof Box with Five 1/2 in. Threaded Outlets

https://www.homedepot.com/p/204208043

Mazura · Accepted Answer

He has an old work box. You have exterior grade; you can put that wherever you want. If you're worried, use dope on the knock-out plugs and the fitting.
Drill a hole in the eve right up against a joist (1" hole saw, or however big it needs to be to actually fit the fitting - it's always bigger than you think). Put the wire through the hole and into the rear KO, then angle your screws to grab the joist. Or add some framing to catch a screw from the other eyelet. I wouldn't caulk anything.
In the future, always plan the end point before you begin.

How to install surface mount box under eave with aluminum covering

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