I bought two and have them standing on a table, side by side. Although I did not want the rack to be bolted to the floor, so I could move it if necessary; I did want it to be stable. 5? Bluetooth Speaker,LFS Wireless Speaker Portable Loud Stereo Sound 10W Rich Bass 80ft Bluetooth Range,MP3 Mini Speaker Bluetooth? Speaker Portable - Mini Bluetooth Speaker w/Superior Clarity and Enhanced Heavy Bass, Powerful Big Sound Driver, 33Ft Wireless Range, Up to 6 Hours Playtime Premium Wireless Bluetooth Speak by Rock Space? MuveAcoustics Portable Bluetooth Speaker - Loudest Wireless Stereo Sound for Home and Travel, Blue? OontZ Angle 3 New Enhanced Edition Portable Bluetooth Speaker with I went with a 6 and they are perfect! The arch support helps when Im at my standing desk. manufacturing variation). Im leaving this review as 2 stars because technically, the coil whine can be drowned out with loud music and being out in a loud public setting, but the moment it gets quieter, you can hear it in full. Love, they fit perfectly, dont go bigger They?ve completely fallen apart and are headed for the trash bin. Apartment living equals shortage of space- and this rack freed up coveted counter/cupboard space.