I use the Dsan LSP-1 (a stereo version is available as well), you can read a review on my site here: http://praisetracks.com/dsan-lsp-1
Recently I have added the Apple 3.5 mm headphone dongle that some use for the iPhone 7, 8 and X. This plugs directly into the lightning port and into the 3.5 mm connector on my LSP-1.
This not only gives you a balanced input but also a volume control and a way to just disconnect from the lightning connector without worrying about the front of house channel being open.
It has really worked well.