If it would help, I can takes some pictures of anythings described below and either post them for you or PM them to you.
I do a lot of two level stands. A long time ago I realized that one cannot have a tank at ground level and make a siphon work O.K. in it. Also, it is hard to work on a tank when you must look down through the the water to see anything. I was not able to spend a lot of time sitting cross-legged on the floor to see into one. The result was I needed to find a way to insure that the bottom of an under tank on a stand would be close to 12 in. above the floor. I wanted to be able to sit on a low stool and see into the tank vie the front g;ass. Although I am short, and despite mu age I still have good balance, so using a stool or small step-ladder to work on a top tank wasn't an issue.
I came up with a solution to get the stand to be taller. I use 4x4s cut to be a little longer than the the depth of the stand (front to back). I would stack two such pieces and join them via plates with screws, that gave me close to 8 more inches of elevation. I have a mix of stands which included the Titan-eeze modes for 48x12 and 36x18 in. hanks. When placed on the floor, the lower level will be 3 in. above the floor on both models, but the 36 lenth had the top level at 28 inches while the 48 in. length was 31 in. high. However, by adding the 8 in. high stack of 4x4s, the ultimate height are as follows: 48 in. long is 11 in. above the floor on the lower level and 39 inches for the top; the 36 in. long is the same 11 in. above the floor but the top level is only 33 inches above the floor. So you can adjust things as needed.
It is possible to manipulate the height of the blocks I place under the legs. (These face front to back.) A single 4x4 raises things by half of the above and using a 4x4 with a 2x4 would raise them by 75%. I have also done this raising trick using a 2x6 on end. But this requires I make the base mimic the frame of the tank (I make a rectangle out of the 2x6s on end). The thinness of a 2x6 requires this design to be stable.
The titan stands are lightweight but like anything, they have their drawbacks. While there is no question they support the size tanks for which they are desiged, they will "rock" if you push on the front of the top tank. Do not fall against one as I believe this could make it tip ove. This is amplified by how I raise them as the center of gravity is also being raised. I should also say I have sed several of these stands for years and never tipped one over. The second problem I noticed is they are not level in term of the long horizontal run. Only the frame of the tank being supported is normally adequate. However, I notice after I have filled a tank on my first that I could see light between the frame and the stand along the lenght, both the front and back. This freaked me out because is is howe tanks normally crack from the stress on the glass. But I have never had a tank crack from this. I assume if a lot of the frame is supported it will do. I would be reluctant to use these stands for larger tanks - say over 75 gals.
I have a method I used when I built my own wooden stands. I used strips of self sticking foam insulation from 1/2 to 1 inch thich around the entiore supporting edge of the 2x4 upon which the bottom tank frame sat. This compensated for the irregular surface of the 2x4 by the weight of the tank compressing the foam as much as needed, thus, self leveleing. I did not do this on the Titan stands as I incorrectly assumed things would be completely level out of the box. Despite nothing going wrong in this respect with The Titan stands, I would strongly consider using the same foam trick on Titan stands if I had that option again.
I also use a couple of angle iron stands. These are very sturdy easy to paint any color but need some dense wood under each leg of you will damage a carpet or floor. Google angle iron aquarium stands to find these. I have one for a 75 and another for a 50/40b, with a half inch oach pad under the legs it is 29 inches high. Use the 4x4 trick and it comes out to be exactly 36.5 in. tall :-( You can only put a smaller tank in the under level and you will need to have a wooden layer on the bottom to put any stand there.