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I have got that Getzoo labyrinth house & although not in use at the moment it is a good house, the rooms are a good size, I do fine with some of the Rodipet labyrinth houses there are just too many rooms & they're a bit on the small size, think they'd be better with just 2 or 3 rooms tbh.
This is my favourite house, the rooms are a good size & they tend to sleep in one & pee in the other so you can put a small litter tray with some chinchilla sand in one room.
https://www.rodipet.de/shop/haeuser/...us-dalani.html
This small house from Getzoo is ok too, just about big enough for a small dwarf ham.
https://www.getzoo.de/getzoo-dsungi.html

I do think one larger house tends to work better, you can always put other smaller hideouts in for them as well as the main house.
You may not want to be buying from Germany of course but hopefully that will give you an idea of a good size.

ETA I forgot to mention that if you use a wooden house it's a good idea to paint the inside with plastikote water based enamel then if it gets peed on or just generally dirty you can give it a wipe down no problem, untreated wood is impossible to clean.
About those legs for houses, with Russians I find they don't tend to burrow under their houses so I don't find the need for legs on the house I just put it on top of a few cm of substrate, Chinese hams on the other hand just have to burrow under everything so legs are a very good idea! You can just buy dowels & glue them on with a non toxic glue if you do want legs on your houses.