I bought a $60.00 double gun scabbard from Cabelas. Should work with or without rear net. You can barely see it above rear tray. I think its 52" long and has zippers on both sides. Lots of external secure pockets too.
I have something similar that I bought at Sportsman's Warehouse. It also has 3 storage pockets (one's pretty good-sized) that help keep things a little more organized. It works fine with the rear cab enclosure and doors. Best $90 spent so far!
I bought double gun rack from Big Sky racks for utv. And split it into two racks one under roof, another in front of driving panel when its warm .
I use only carbines rifles so length is no issue. ( all rifles less then 45 inches)