Whilst not designed for medium format cameras, the QR11 is surprisingly effective on the GFX, but does impede both battery and cable door access.
FUJI X PRO 2
Whilst the QR11 appears incompatible with the X Pro 1, on the X Pro 2 it sits beautifully, but does impede battery access unless offset.
Whilst the QR11 fits well on the XT20, both cable and battery doors are impeded.
FUJI XT1 & XT2
On the XT1 the battery doors is impeded and requires bracket removal to access. The XT2 is a much better fit, and with a little adjustment enables access to both cable doors and battery. The screen is not impeded in either case.