Wile I think it is wrong to attach emotions to reptiles as they simply do not have them. But there are some species like Trevor said that do form family bonds, some even communally caring for offspring. I think that's more along the lines of what Trevor was getting at. So to say 2 reptiles can't be housed together because they are reptiles is a false statement. It should be "because they are not the right species for having viv mates."
To the OP keeping 2 veileds together even if it works, isn't something a novice should attempt. It takes some level of experience to see the subtle signs that one of the animals is getting stressed or being out competed for food/basking. I have no idea of your experience with chams so don't take my comment as me calling you a novice. I'm just stating a fact.
The sad part is that usually by the time problems are noticed by the untrained eye, the damage is done and one of the chams is effected in some way or the other. Common long term stress symptoms include but are not limited to bent/brittle bones, emaciation, dehydration, and even organ failure.
For your's, at the very least provide separate feeding cups and basking areas. Don't free range feed. To make sure both get enough to eat you would have to put a lot more insects in the cage than if there was only one cham. More than you would want to have running free because all of them will not get eaten and inevitably every night you will be removing feeders. Separate basking areas require large cages. This is hard to do in a 2/2/4 enclosure.
OK with that mouthful being said, your cage looks nice if not a lil on the small side. You would be surprised just how much larger a 2.5/2.5/4 is. That extra half foot makes for a much larger foot print.
