The Du-Ha is what you want. Can keep 3 rifles under the back seat completely out of sight. Can also keep all the crap under your back seat from rolling all around. It also meets the qualification of case for states that require it. Worth every penny.
Du-haI also use the lucid snap rack. It is instant access and I believe also meets case or rack requirements. Can be concealed by draping a jacket or hoodie over it if need be.
Snap rackI’ve got both and use both. For the snap rack install, make it as tight as possible and save the extra elastic so you can re-do it a few years down the road when it wears out. Mines 10 years old and I have redone the elastic a few times.
The snap rack can scratch the barrel just a little bit. Some electrical tape (blue of course) around the barrel or on the rack will stop that. With something on the floorboard wedged against the butstock it is surprisingly solid. The video does a good job showing it. It’s available at Amazon for a little less. I believe the DuHa can be had at Amazon or real truck as well. The DuHa will not mar the gun at all. Something like 50,000 plus miles without any marks.