You're right, I was also worried about getting water logged.
Here is my first bed and how I avoided waterlogging :
I realized my first wicking bed is 4 or five years old. After this bed, I converted another 3. The other 2 don't have the anti water logging feature, but they are at most 1.5' deep so maybe that is why they don't get too wet? But still, they could be 1.5' of water in a very rainy climate (But I'm in Texas where dryness is the problem).
I'd definitely use the anti waterlogging feature, but the other 2 beds would need some work with a 1.5" masonry drill since I didn't know about wicking gardens when I built them.