If you have such a dense canopy like on the picture I don't think you'll need to worry about lenses and penetration. You'll get good penetration from the multiple lightsources without lenses shining at flat angles through the canopy.
I worried about the same points you do and thought I might need lenses, interlight or change to scroging. But I was surprised when I saw the first led run, and that was with cobs at very low wattage. Branches grew much stronger than with less more intense lightsources and at least as far down as before.
I'd try with bare cobs first, the more the better, and add strips for interlighting or play with lenses only if necessary. Or try to add lenses only to ¼ of your cobs to compare. Good lenses or reflectors aren't that cheap, so I wouldn't want to risk ending up with a lot of expensive lenses i don't need.
And you won't lose much, cause if it's perfect with lenses it'll still be really good without!