I printed it using tree supports and with the bottom of the shelf adhering to the build plate. I specifically made it to fit my Skleia desk shelf but it can be adapted to fit other types of shelves if needed. Also I would recommend adding some 3M 9448A double coated tissue tape to one or both inner sides so that the stand does not wiggle around. I also recommend smoothing out the little cable hole at the top a bit so that it does not fray your cable.
Link to TinkeCed file: https://www.tinkercad.com/things/1OwFOVSycNA?sharecode=e1Ntl9rhHKMo-H3Q77_WjdKxU4MEgtvVanAqo0wIIp0
The author marked this model as their own original creation.