You can get a better/bigger voltage regulator with dual output voltage. They will both stabilise your voltage, and give you 110V output for your US equipment.
As Wrye said, many things will run without conversion to 110v, but it never hurts to run it through a regulator.
You can plug many things to the same regulator depending on size. If you have a 3000W regulator, you can plug a total of 3000W equipment to it. Just sum up the input wattage of them. If it's not listed, multiply Voltage by Amperage.
On wrye's sample image above it will be 240V x 2.4A = 576W.
Most likely you can exceed this too, as they don't constantly draw the same power. An even better voltage regulator has a meter showing how much power is being used, then you know for sure how much you can connect to it. It's typically more than you think.


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