Right... i'm talking to the seller right now, maybe I should ask what lenses he has available to change them out for my current mounting height (I think its 8 or 9 inches since I use the AMS mount, I was thinking of doing something similar to this:
The 120 degree lenses would be the closest match to a stock Radion. If you mount them like you pictured, I'd probably make the front bar articulate a bit so you can aim it towards the back a little. It'd help reduce spill and glare from the front of the tank.