I only deducted one star Because The bottom rod is not perfectly balanced and does not hang Entirely horizontally, but our boy obviously does not mind.
We are using this mobile over his IKEA bed with the "sigikid 49002 - Mobile Rack Soft-Mobile Size: 575 x 385 cm" which I bought Simultaneously. The combination works well, the height is perfect: well within sight but as of yet just out of reach. I bought a second rack to use the mobile over his play pen too. Note: we are using the mobile Without a music box and the top rod of the rack in the horizontal position, but I'm fairly sure it would therefore work with a music box and the top rod in the upward position. The mobile is too wide to hang on its own from the rod in the upward position though: it will get stuck on the rack and not spin freely.