There is an extremely high chance that two beardies regardless of sex will fight if housed together, and the results are usually tragic.
Tragic as in one or all will very likely end up dead or seriously crippled, so it is not a good idea to house beardies together.
Even if they don't kill each other, the added stress of living together will result in them having a significantly shorter life span then expected.
if you do decide to use a single viv, then divide it up so each has it's own space no less then the size of a 40 gallon breeder (36"x18" floor space), and use dividers where they can not easily see each other through the glass.
**Edit to include the setup info**