Hiya,
congratulations on your new Robos
As you have already found out, the spelos is not a very good cage, but i am sure it woudl be suitable just until the new cage arrives - they sound like they are only babies, so they probably wouldnt squabble too much in the next couple of weeks anyway.
How big is the plastic container? if it is even slightly bigger than the base of the spelos then i am sure it will be fine too - better actually, as it doesnt have the tube.
I wouldnt recommend the rotastak though.
Also, it would be a good idea to check the sexes of both of your robos as pet shops more often than not get it wrong!
Tammy x