[Renate]

I had previously never used covers. I installed a "T-nut" on the back of my devices with the flange on the inside or outside of the case. That gives me a 1/4-20 threaded insert (same as a camera) to install on stands or feet.

My Poke3 has a cover that I kind of like. I glued the T-nut on the back of the cover instead of directly on the device. I have a "foot" composed of 1/4" set screw, 1/4" threaded coupler and one of the three little gooseneck legs off a mini camera tripod. When I don't need it I can unscrew the leg. Admittedly when you are not using the foot you do have the T-nut still sticking out a bit. It's not that bad. Still, for small (6") devices I find the the foot (or something more ergonometric) is a nice hand hold, like those sticky things on cell phones. I also have a bendy arm over my bed to hold the Poke3.

Edit: Or if you want truly low tech, get a scrap of that rubberized drawer liner, the kind that is like a rubber screen. You can use anything as a back support, books or a wooden angle you make yourself or even something else with a tilt stand. Set the liner underneath the back support and the Boox won't slip on the desk.