If you cant use ceiling or wall, and are uncomfortable with using the tank iself, that leaves 1 option that I like.
You can build mount onto the stand.
It can be as simple as 3 pieces of wood making a shelf drilled into the stand. Or as complex as stick framing a removable enclosure around your tank, and then using 1/8in paneling to cover it, then painting it to match your stand. You could take the entire thing off and on, for heavy maintenance. Or you could drill 2 acrylic dowels into the stand in the back, then drill in an acrylic mounting plate for your two lights. EDIT: Oh and you can get one that has adjustable height since people seem to want to adjust them and get things perfect. OR you can use clamps and raise and lower the plates that way.
The option I like less, but useable if you are also not comfortable messing around with anything on your stand...
You can build a tv dinner stand for your tank... LOL
http://www.amazon.com/PORTABLE-ADJUSTABLE-HOLDER-DINNER-TABLEMATE/dp/B00F8PN39W
Well you get the idea, just need the counter balance bottom and slide it under your tank in the back. People will only see a tube, or piece of wood, and your lights mounted on a mount. Once again you can go easy and cheap, or stylish and complex. But it the same principle either way. If you do it with metal tubing, or plastic tubing for the middle part you can set it up so you can slide it off and on and assemble it under the tank without moving anything. A slight bend will make it easier to balance. and stop it from tipping over, if you are using light weight materials with limited counter weights. Anyway, look at some stands like this and I am sure the web has a diagram somewhere if you have no idea where to start.