There are two types of hooks. You can either go with box type hook or ring type hook. Both almost serves same purpose. But if its for a bigger painting, ring type hook is suggested as it has better rigidity. The minimum quantity is 5 pieces. For bigger paintings use two ring type hooks.
 
Meenakshi Balaji Arts has come up with framing materials to enable tanjore painting artists to frame their art without depending upon anyone.