Same deal with the same guard a couple months back. I had issue with the front deraileur making contact and occasionally catching when i first installed it. Tried slightly raising and adjusting the fd, but in the long run had to take it into the shop to get things sorted. Still have some glitchy shifting, mostly dropping into the granny and then back. Middle to big and back works fine. Kind of a PIA, but it allowed me to keep the big ring intact for some road use. Don't ride road too often though, so i may eventually drop down to 2x if any drivetrain changes end up needing to be done.
Does look pretty bad ass😀