Ok need a quick answer I just found out there is a tech event today right by my house I want to go. I know one of the techs and her own car seat usage is horrid and she installed a friends baby rf with straps above the shoulder ekk so I want to go in and see how she does. Plus hopefully meet the lady who was able to get me into a closed class in october. I wanna take my rf Britax roundabout 55 with my 2 1/2 yr old in it my ? is about the rear tether the driver and passenger seats have plastic guards over the metal so i cannot use them, so I was wondering if I were to move him to the 3rd row and put my daughter in her booster in the row in front of him could I use that ancor to rear tether the seat since its being unused??