Mostly they should be. The main reason to have smaller houses and hides is - it's all that's necessary and saves cage space. I think the Rodipet ceramic terracotta hide could be too difficult to get in and out of for a dwarf or robo though - It has an angled side doesn't it? That could be difficult to climb up - robos aren't great uphill (some have furry feet/soles).
I think they generally prefer cosier things maybe in terms of house height roof but a house should be fine. As I mentioned before I had a large cork log for our first robo and he used to spend ages inside it scratching bits off, and climbing over it. I think anything enclosed feels fine for them though - as long as they can get in and out easily.
The Syrian Rodipet labyrinth house again, the top entrance may be too high for a dwarf or robo to get out of.
Do you have photos of individual items?
