IMHO you're never going to get the head room you want with an undermount.
The right answer is a mount/rail combo along the lines of the Bride FO rails where the mount and sliders are all one unit and then pair that with side mounts and a low seat.
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'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
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