XAqua Overflow??? Water level if mount using template?

[duganderson]

If you mount the Xqua on a rimless using the template, how much lower from the rim is waterline?

 

[griss]

I've no experience with these but, on BRS' website under the Product Questions tab they are not recommending it for a tank larger than 30 gallons.
Here's a video of one in use that may be of some help.