If you like Indian food and want to cook your own dosa, then you will need a griddle of some kind. One way to go is to get a stand-alone electric griddle that will sit on a counter or on the dinner table. There are a few advantages to this method. It leaves your stove burners free, letting you cook other things as you make your dosas. Also, being electric, it is portable. You can plug it into a living room outlet and put it on the dining table. You could also bring it to a gathering, where many people could enjoy your cooking.
I like how simple to operate this one looks:
Dosa electric griddle pictured: CucinaPro Crepe Maker