Chainline will be set up in the range of a MTB freewheel, around 52 - 54mm, will line up with most outside chainring positions on a MTB crank. Water bottle bolts or disc brake torx head bolts work just fine. I run 52 gear inches off road, single or fixed.
I know Tomi personally and will vouch for him. Good guy filling a void that needed to be filled.
Mounted up
In Action