they need to be mounded more to protect the tubers from ultra violet rays sending them green.

you use whatever method suits your gardening style or determined by how much room you have, we sit our seed 'tater's on the ground cover them with some mulch and compost then add much as they grow, check our instant potato patch that delivers somehting like a 6:1 ratio ie.,. 1 kilogram of spuds on the ground returns 5 or 6 kilograms of spuds at harvest time.

would use paper with care as it may hold too much moisture.

with the different varieties all you can do is try it and see, you never know what may work for you.

len

Here is a link that might be useful: lens garden page