I decided to put two separate power supplies in. The bigger one is connected to most of the 24VDC-LED-strings (~300W) and the smaller PS supplies power to 24VDC IKea drawer lights and some utilities.  

This helps to save on stand power because the big 480W supply only gets switched on when someone turns on a light. In contrast, the Ikea drawer lights constantly need voltage to switch on via their internal sensors. 

To monitor the load on each supply I bought two cheap volt + amp-meters from Amazon. (the DIN-rail-holder is from Thingiverse: https://www.thingiverse.com/thing:3486542 )