I also have this cage HQ Large Sturdy
It is a sturdy cage, however if your gliders move around in a noisy fashion (s/a: jumping & sometimes wheel noise, tossing things about the cage) you will still hear them, but not too much rattling.
The next size smaller HQ Sturdy
Fine for 2 gliders, however larger is better, so if you have the budget, I recommend the larger one.
I personally have a like/dislike of the 6 additional doors on front, meaning sometimes I like them sometimes, sometimes they bother me, usually when cleaning (I changed out the zip ties provided for reusable ones so I can clean between the doors on major cleaning days). Most of the time, those doors don't bother me at all though.
You can purchase basically the same cage without those 6 additional doors and added shelves (which I did end up purchasing 2 shelves from the following site for my cage, I like having platforms) Congo
I also once had this cage from this site, it's good for smaller floor footprint, a little more space from the Brisbane, not as much as the Congo. Also HQ and a nice sturdy cage. Madagascar
Many people also like this following cage Critter Nation
I also believe Petsmart has a similar cage.