Product Showcase - Interior

As you can see at the rear side, the 303 is equipped with removable brackets. To your lower left, mounting place for two HDDs. 
 

You'll find tool-less drive trays that will support 3.5" drives ready to be inserted into the chassis. Installation of the HDDs is really easy. You secure the HDD and mount it onto the tray as shown below.
 

So your HDD(s) will be out of sight and the wiring nicely tucked at the backside. There is enough room for cable routing BTW.

 
Cable routing is a strong point for this chassis series BTW, we'll demonstrate that in the next few pages as well. 
 

Let me quickly move towards the frontside tray again, here you can mount the SSDs in a similar fashion like the HDDs, these will be in sight, cables can be routed to the back. You may mount two of these.