I don't understand what kind of advice you're looking for? Just strap the seat in and you're good to go.

 

These specific models- any insight on models they have chosen- pros and cons- how they fit. Specifically the tethers. Our britax car seats required tether extenders… Any booster will work, you’re right but perhaps I should rephrased! Precious cargo- Wanted the details from ridgeline owners!

 

I assume that you're asking about highback boosters because you mentioned tether extenders. I had the Diono Radian convertible car seats. Didn't need any tether extenders. Had them three across. Worked great with the harness. Kids struggled to buckle the seat belts on their own in booster mode due to the limited amount of space between the seats to reach the latch, but that problem wouldn't exist if you had less than three.

 

This may not be what you are looking for, but this is the seat I used for my grandson before he grew out of it. Being able to grow with him was a selection criterion for me. I used the seat in the back center position tied into the LATCH system and was very satisfied with it. My nephew and his new daughter are now using it.

Amazon.com: Graco Tranzitions 3-in-1 Harness Booster Car Seat, Forward Facing Car Seat, Highback, to Backless Booster, Black

Amazon.com: Graco Tranzitions 3-in-1 Harness Booster Car Seat, Forward Facing Car Seat, Highback, to Backless Booster, Black

www.amazon.com

 

Sorry, I too do not have experience with those brands, but I had a handful of different Graco all in one type seats tethered to the latch anchors without an issue over 4+ years in my 2018. One thing I will say is that the upper latch didn't work well in taller all in ones because of the location of it. On other vehicles, the top latch anchor was in the middle of the back of the seat, so the strap went over the seat and you could really strap it down. With the RL, it is right at the top of the seat, so depending on where it is on your car seat, you might not even be able to use the top. This was the case for a couple of the seats I used, but I was able to get the bottom latch tight enough that the seats would not budge.