It would be the same as using multiple BestBuy gift cards. You can use I think 9 gift cards in a transaction without the cash register requiring an override.
Personally I have used 4 gift cards & a debit card in a single transaction without a problem.
With Visa gift cards, it may help for them to know how much the gift card is valued at, so they don't try to "ring up the whole amount on the card" only to have the transaction denied (some people don't realize the difference between a Visa gift card and a Visa credit card).
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Before posting I try to research everything first or use my own experiences. I do not now nor have I ever worked for Best Buy. I work for the competition.
If you respond to a post of mine, I will read it. I may or may not post in the thread again, but rest assured I will read your response