It's meant to be printed in 2 parts with the end-sides down. You'll need supports for the handle indents. I attached them with epoxy but CA glue would likely be strong enough (maybe). There's also an indent on the bottom that you can glue some grippy material into so the holder doesn't slide around. I've never had good luck attaching this using CA glue so I'd recommend epoxy.

Also sorry for the non-commercial license, it's because I'm using the free version of Fusion 360.