This is a tricky question :)
Officially, you have to set a different funding address for every miner you install.
Unofficially, it works with the same address for each miner. The trick is to use the Recover Key button after you install your second miner, and then enter the password and all 12 words of the phrase from the first miner.
This way you'll be using the same funding address for both miners.
The problem could arise when both miners try to post their results at the same time. You can avoid this by keeping them on a different schedule. It's extremely unlikely to happen, in my opinion, when you have them reporting daily or at even longer intervals.
So, yes, I am funding all three miners that I currently run, from the same address.
Yet, it is your decision and your risk! :)
ha ha not a financial advice. I get it. Thanks for the clarification.