Agree with the others
As Drago says they are better with more floor area than height and like roaming and digging. I think they need a platform and the Trixie one that Barley mentions is ideal. It also gives them something to sit under and something to climb up that isn't too high. They sometimes like to sit on a platform to have a wash, plus it gives you more surface area to add toys and hides.
In my opinion Hamsters only really climb if they are in a tall cage - because they can! And maybe to see if they can get out of the top. And they're not very good at getting down and tend to just drop and can hurt themselves.
The key is enrichment - so different levels is good, places to go, things to do, plenty of substrate to dig in and a house that's big enough for a good sized nest and is dark inside. Another option is to have a large house with a flat roof that doubles up as a platform - and have a smaller platform at the other end
Rat sputniks are also popular and something to climb into (they hang quite low in something like a Zoozone so they can climb in from the substrate level). They tend to be popular "basking" places if you put some bedding in them. It's difficult to place with the lift up lid but I think they fit ok if it's towards the back of the lid where it hinges - then it lifts out when you open the lid so you need to check your hammy isn't in it first! Likewise a grass hammock could hang down from the lid and give something to climb into and sit on.