Would a cantilever lpvo mount fit on there? I don't have one for reference
It depends on the length of the mount's base and placement of it's cross bolts. I can tell, that I had to dremel off around 1cm of material inside of GG&G 1383 (Accucam QD FLT) to make it's front fit over the front attachment post of the rail.
Actually, I see, that there is some difference in this new version of the rail. There seems to be an extra slot cut in the front, so it might be fitting longer bases.