drawer system anchoring

[Zreego]

I've long been admiring the various drawer/organizational systems and have been inspired to build one myself. My understanding is that they are secured to the floor by where the seats attach. True? What kind of system have you all put together to attach the drawer to said point?

Thanks in advance

 

[Front Range 4x4]

About what I asked here:https://forum.ih8mud.com/showthread.php?t=121745