"No backer" means there is not really any meat in the floor for the recliners to mount into. We put aluminum tubes where we need to, to mount the sofa. The mounting points for the sofa are different.
Its like your house. You want to hang something heavy on the wall, you need to find a stud. There isn't one where the recliners need to mount.
We could install them at the factory for a brand new order. But to retrofit something, you would need to replace the slide floor. (if you wanted to do it right). As I said, others here have swapped out Lazy Boys and just bolt through the floor.
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