As someone who spent a bunch of time making brackets to use in the front, I’m not thrilled with the comfort of these seats. You could save a ton of money just finding some second hand ford captains chairs that go right in.
Having sat in a lot of seats in my career, from Ford captains chairs to Recaro's and others, I respectfully disagree. I had 2 pairs of cloth 2011 Sienna captain's chairs(ie non-recliners), then 2 pairs of 2015+ Sienna leather recliners...in both 2nd row and for driver/passenger(with footrest function disabled for driver). The cloth captain's were fine to start out with in VandianaJones, but I didn't know better. Then sitting in MG's 2011 Sienna recliners changed my mind about the captain's; the recliners were damn good, although I didn't like the bunched leather look of the 2011-2014's. So in 2015 IIRC when Toyota released the sportier perforated leather recliners, I upgraded to those and they were worth the $ for me. The leather was a bit firmer so more supportive, vs the cloth squishier and more fatiguing. And of course 2nd row passengers were on cloud9 with being able to recline in transit and chill. But yes, I had to mount them (on L-track) quite a ways back in the RegularBody E350, in order to allow the recline function. However, this gave us an area between 2nd row recliners and driver/passenger seats for our furry kids to be secure near us.
Fast forward to the scheel-mann VarioR's I had for driver/passenger in my Transit, and those are just world class seats. Even firmer yes, but understand that firmer seats = more supportive = your body can relax and not have to support itself over a long haul = less fatigue after 8hours of driving. Compare that with the squishy RV seats which feel super comfy at first, like a big cotton-filled bean bag chair, but that means that it gives your body no support = your body has to support itself = major fatigue after 8hours of driving.
Unfortunately with seating, every physical body is different, so perspectives are different, and you won't know what feels best to you after 4hours of driving until you ride/drive on all of these options, which isn't easy/feasible to do logistically.