Rather than having individual tethers, I place tethers strategically; in the cockpit, base of the mast, and on the jacklines. As you move around you attach a new tether to your harness before removing the old one.
The cockpit mounting points are U bolts.
Tethers strategically placed is fine and dandy with short handed crews. A race crew with 5-7 folks on a 30' boat, probably better to have individual tethers, jack lines and appropriate mounting bolts/eyes or equal when needed.
I would agree that U-bolts or equal would probably be better for the cockpit, then again, if you have the need for 3-4 folks to tether to the same bolt....might be better to have a short section of webbing.
There is probably NOT a one size fits all in this disCUSSion frankly. Probably best for all to say what and how, figure out what will work for you following what most of us would call sound practices.
Like earlier stated, one person had jackline inside the shrouds, another outside. If the shrouds are attached to the hull sides, inside might work best, if like mine, the shrouds are attached next to the cabin, outside might be better. ALtho I have gone inside along the cabin top, to give folk a bit more room to fall before going overboard if traveling along the lee side. On the other hand, if they are on the windward side, they are now a foot closer to the lee side and going over.......not that a 4.5-5" or 1.5M tether should keep a person onboard a 10.5' boats, with about 8 or so feet to the edge of the le deck in my case.
I do believe there are some rights and wrongs to this need, along with some "depends" issues also!