I’m unsure if this is how the forks disc should be installed?
There is no other way to fix it given the parts that came along the L-Twoo GRT groupset.
The 160mm rotor fits fine.
The 160mm rotor fits fine.
With caliper adaptors, as long as the brake is sufficiently attached to the bike and the brake pads line up properly with the installed rotor, you’re usually good to go.
So, the thing here is that the fork has the figment that was originally designed for the rear brake, so you have an adapter to convert ‘rear’ flat mount to ‘front’ flat mount, and the the front l-twoo adapter thanks to their strange calliper design.
Is there a second rear adapter in the l-twoo box? that should allow you to get away with one adapters on the fork rather than two.
Alternatively, complain to l-two about their stupid calliper design, and use some Shimano or Zrace callipers instead.
Or just run it with two adapters, which should work ok, and is thus more an aesthetic issue than anything.
You’ve attached 2 mounts there. You don’t usually need the bottom one. The problem is your fork doesn’t have standard 70mm spacing.
You need a “rear” ltwoo adaptor, https://www.aliexpress.us/item/3256805735065774.html
The other posters are correct, ltwoo uses a non standard caliper spacing, supposedly due to patent issues. So you need an adaptor to mount it either front or rear. That fork appears to have rear mount spacing, so rather than the front adaptor, you need a rear, which you’re probably already using from the kit, so buy another…and thank goodness you don’t have an sl8, as no adaptor exists.
There’s a user manual on the LTWOO website here: https://oss.ltwoo.com/download/en/Disc-Series_User-Manual_V2.0_EN.pdf
Because your fork uses the ‘rear’ style flat mount standard, you will have to refer to how the rear brake is mounted in the illustrations.
See the following screnshot:
Pretty sure Shimano made flat mount callipers an open standard (I.e others can use without worrying about patent breach), so L-Twoo designing their callipers the way they have surely isn’t for patent reasons.