That's prolly the easiest of ways to do it.
I prefer to use an 18% grey card. Sometimes when I use a white piece of paper to wb, I get funky colors, but that's mostly cause my wife buys the recycled printing paper, so it's grey but not 18%.
What I do is use my grey backdrop, take a pic of the corner on the floor and set it that way.
Just make sure the paper is true white and you're good to go!
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