LLeubbx it is a 1125.
if you really want to sink the plate way under just pull the rear fender and signals just the 3 t27 where it mounts.
Build a filler panel fairly simple.
Plexi glass or some thick plastic .
Build a couple L bracket and mount the plate or just bolt it to the under tray
I just made a filler out of plex and bolted my fire bolt plate frame (has the turn signal mounts on it).
in hind sight i used 1/4 plex which didn't shape well.
You can get 1/16" or 1/8" plastic at hobby shops and cut it with scissors