How are napkins positioned on a table? (Host side)

We don't put them in the glass...
We don't take them in paper form for a sit-down meal; we choose them in fabric and large (the small ones are for cocktails)
Above all, we avoid extravagant folding, however authorized for special occasions (Christmas)

So how do you do it right?

At lunch, the napkin is put on the plate
And for dinner, we place it on the left side so that the delicacy of the dishes is clearly visible (and because potentially the soup has already been served, but we will come back to this soon)
Finally, it is simply folded (triangle, rectangle or square) and so as to highlight the pretty embroidery.