Playing the game will require more mbps than just using the site (obviously)
^i don't know how much but keep that in mind.
Here in Belgium, there are a lot of variations on such usb/internet sticks, to grant you access to the internet wherever you are (garden, train, bus, hotel)
However, they don't come in 2GB, or 5GB, or 10GB..
They provide you endless GB, and you pay the bill for as many GB you have used in that month.
Idk, if you have that option, but that might be a good alternative. (You basically pay for what you use only)