The depends on the look you want to achieve. If you want an ultra modern look, then installing from the ceiling is the best way to go. If you want a more classic or traditional look then install the rod just below the cornice allowing enough room for the brackets/rod etc. 50mm below is good. That way you can opt for a decorative rod. I prefer s-fold from the ceiling than on a rod but it all looks great in the end either way. All the best with it. Here is some photos of some drapes we did with under cornice and on the ceiling.

Such a shame to hide behind sheers. I like seeing out my windows. Just keep your room tidy and close curtains when you do really need privacy.

please clarify the size of the windows and sliding doors.. your post says window is 160 x 66? and what are you aiming to achieve...we need to see floor plans and photos of the existing space to understand the problem better...will the curtain over the window be full length to match the sliding doors is the sliding door and window next to each other, separated by a section of wall or on different walls and do you want the curtains to block light or views or? and what sort of windows are they.. double hung, awning, sliding?? if there is a spearte window with as eparte patterned curtain and you want to increase black out property and keep easy access to ethe window i would widen the track and curtain as much as possible to make to make it wider than the window and add a separate lining curtain that can be hung off the same hooks as the patterned curtains

S.fold heers