have you tried taking pictures under a 45° tilted glass plate? That works best for me for silver coins.
I've had similar questions about photography. Where does one get the pictured stands? Does the white plate come with them?
A good copy stand does not come cheap. Tripods have the downside that the legs can get in the way. Look at a copy stand and fabricate something yourself from the design. At the least you need enough room to move things around, let enough light onto the subject and maintain a stable base so there is no movement when the shutter clicks.
Well, my neighbor is an accomplished cabinetmaker. I myself am totally hopeless with fabricating things.
Maybe you can explain what you require and he could use his expertise to fashion something for you, for a fee or a bottle of something etc.
For my Sony DSLR I use a tripod because I can position it so the legs are not in the way. Fully adjustable, rotational and stable. Legs adjust from 20in to 40in in height. Cost $30 on Amazon. When I am using the phone camera, I stabilise it on a wooden block, but others use soup cans, coffee mugs etc. Anything slightly bigger for a tablet will do. Set the timer to two seconds to avoid camera shake. I hurriedly put together some shots with a spare camera and an old phone for you as examples to show you the basic setups