4U Rack Without Any Rear Support? Hello! I'm in the process of upgrading my home network hardware. I purchased a wall mountable 4U rack from TecMojo. I plan to put a 1U UPS, 1U switch, and 2U shelf in it. I've started to set things up, but I quickly realized that there's no rear support whatsoever. Essentially, the entire weight of anything I put in the rack is supported by the ears on the front of the rack. There's no side support nor anything in the back. That seems very wrong to me. What am I missing here? I don't know if I can put Amazon links here, but here's the descriptions: Rack: Tecmojo 4U Wall Mount Rack,4U Rack 13.9 inch Depth,132lbs(60kg) Weight Capacity,19" Network Rack for Shallow Server and IT Equipment, Network Switches,Patch Panel Bracket,Black Shelf: Jingchengmei 2U 19-Inch Universal Vented Rack Mount Cantilever Server Rack Shelf-12 Inch Deep-Disassembled Black (2U12InD) The rack itself was quick and easy to put together. There's a back panel with holes for wall mounting to studs.…