I think the key to an effective blind tee shot is to have a receptive target on the other end. When I think of the many good holes in the British Isles that I have seen with blind tee shots, the landing area is almost always flattish or gently sloped, but not severely sloped. The blind holes at Royal County Down are good examples, especially a hole like #9. Likewise, the most effective blind greens seem to be flattish or punch-bowl shaped, like #17 at Prestwick.
I think you can have semi-blind shots with more daring slopes, for example #2 on the Crenshaw course at Onion Creek where the right side of the fairway is hidden but the visible left side slopes sharply to the right, so you can take your chances on a blind shot down the right or use what you can see and bounce it in from the left.
I like the use of directional stones to indicate the ideal line, as well as the use of squared or cornered off tee boxes that are aligned down the ideal line.