I have a 180G with dual corner overflows.
My wavebox dial setting is at 9 o'clock. You have to be patient and wait for about a minute to get that rocking back and forth motion to settle. Once it settles, then you can fine tune the dial further, but in very small increments. You will know when its dialed in, you will see a see-saw pattern of your water, waves, and the splash that you will hear from your overflows will go in unison. (left splash, right splash, left splash, right splash) Its totally cool to watch.
My box is set next to the side of the overflow. I cant put it in front, bcoz I also have the 6100 streams and thats where the stream sits in front of the overflow.
It's a great product !