Mine ended up that way because on my driver side, the extra height of the slider (3/4" to 1") meant the tippy top of my seat hit the bk bar extension mounting point and cost me about 1" of legroom that I really needed... It is perfect now.
Pax seat... I guess they can sit wherever we put them
I went slider there because I didn't want to have to take both seats out if I had to get to the panel behind the seats.
If a slider fits the driver side, fixed mounting sounds good on the pax side.
I have a 2nd Profi XL inbound, unsure if I am going to floor mount it or put on sliders. I've already had a few folks slide my current pax seat back and squash my bk roll bar padding and make a dent... (luckily it went away....
)