I am not a quad, so I apologize if it is not quite applicable, but I use the Taylor Mobility Solutions plate in the link above and as a para, I love it. It has made all the difference with getting on and off my zero turn mower. The video below shows a quad attaching and using it, so it might work for you. I don't know how flat your property is, but since I have a large slope I have to mow, I use a rope to tie myself to the seat of my mower. It keeps me from sliding off forward or the sides. Even when just hitting bumps, I appreciate being tied to the seat so I don't slide down in the seat. Feel free to ask me any questions if you have them.

https://www.youtube.com/watch?v=2eof8UHp3Hs