+1 on being able to clip in while still in the cabin before coming on deck.
Here you can see a Wichard double-action clip on a U-bolt just below the companionway sill, with the tether leading over the sill into the cabin. Once below, the user can unclip their tether from their harness and they are free to move about the cabin.
You can also see the yellow webbing jackline running up the leeward deck.
At the aft end they terminate with a cow-hitch like so:
This is well forward of the transom.
The forward ends are belayed onto my side bow cleats:
We put twists into the webbing when rigging them so that it is relatively easy to get the hook onto them. If they lay totally flat on the deck, you might need two hands -- one to lift the webbing off the deck -- in order to clip on. Especially if they are wet. The twists don't cause any problem when stepping on the webbing -- it flattens under foot and doesn't roll.
Finally, depending on the materials your jacklines are made of, I would argue that they should NOT be permanently rigged. You should take them up whenever the boat is going to be left idle for any period of time, for example, otherwise the material will degrade with exposure to the sun's UV.