[abcha0s]

You didn't mention the length of your tank or whether you have a standard or nano wavebox? - This is relevant as it will determine the maximum hieght of the wave you can generate. Assuming you can easily generate a 2-3 inch wave in your tank, the question then is how big of a wave do you really want?

If you are aiming for a 2" wave, then your pivot point will need to be about 1.25" below the top of the tank. This is 1" for the wave and .25" for safety. Your overflow should then be put so that the top of the waterline without the wave is at 1.25" below the top of the tank. Your return pump will play a role here as a big return pump will push the water level above the overflow more than a small return pump.

Remember the waves are adjustable within a range as determined by your tank. Where you mount the overflow is one of these factors as it sets the pivot point and determines the maximum wave hieght.

Waves are an interesting thing. You may decide that you don't like looking at the water level rocking back and forth. You may want the wave to be hidden behind the trim. This might mean that you can't create as big a wave as you were hoping, but you might not get sea sick looking at your tank. I guess this also depends on whether you have a canopy.

Are you aware of the structural considerations for tanks with wave boxes?

Good luck with your projects! - At the end of the day, put it at wherever hieght you want. Just make sure that it is dead centre in the tank (pivot point).