https://www.benroeu.com/products/benro-gh5c.aspx example, arent't you able to rotate vertically also since it rotates horisontally? Just use the plate which comes with gimbal or am i understanding you wrong?

Even thouhg, R6+800mm is so light set that you could use this also if i am not mistaken:

https://www.acratech.net/gp-ball-hea...d-pan-feature/