New set up, need advice

[EquiReef]

Ok, I will have to try and test and see if it is tempered. The glass is thick with no bracing at all so I am assuming it is tempered for strength. There is a stick on the bottom of the tank with a bunch of warranty info but it doesn't say if it is tempered or not. It is a Miracles tank however so maybe they will be able to tell me. Taking the tank to NAFB is not an option, this tank is never leaving my basement again, we had to hire movers to get it in the house in the first place. So I am thinking we will need a HOB overflow kit.

Where is the best location to put the HOB over flow on the tank? In a corner or in the middle? Should I have two? Working on a sump design at the moment, will most that when I finish it.