I'm gonna say get the rack mount save yourself the PITA. Be careful where you mount it too. Noise!. Some gear doesn't play well together. A little trial and error. I use 16Us.
I had one 16u with 3 Russco TT, 2 on tool box roller drawer guides. They were so smooth you could QUE and close the drawer and the stylus would stay Qued for 3 songs, just flip the On switch (s) to the TT that were Que up. We didn't know what a DJ was.. :-)