As per Dave’s link, I used Rob Wagstaff’s / Canvas Windmill plastic fittings.
They are quite discrete, under the gunwhale – close to the hull.
How many – depends on the diametre of your bridal rope. We had (I think) 3 down each side, which was not enough with the 3mm bridle rope. So will be adding a couple more.
We manage without any on the foredeck, instead make a Y junction to the stemhead with just the bridle rope.
It depends on your tent, but ours sit forward of the deflectors, so clips there are no good.
hope that helps