Print them on their sides and use Brim and Supports from build plate options!
I always use my Xbox One controller and I've encountered problems with Guillermo Wismann's controller and headset tower. If you put the Xbox Controller nicely in the middle of the support arm from the tower then it holds pretty alright, but when it receives vibrations (Me bumping my table) it sometimes shifts and when it reaches one side of the controller, then it dramatically drops from the tower and falls to the ground and it has done it almost 10 times already and I don't want my controller to brake so I quickly designed these adapters! I also have a Ps4 controller which I tested on the tower and found out that It holds even worse there so I also designed an adapter for it as well.
The Steam controller already held pretty good, but with both adapters it holds even better!
The author remixed this model.
These are just additional adapters that hold Xbox One & Ps4 controllers way better and prevents them from falling.