UPDATE : V2 no support needed published. you will need 6 m3x20 (or any screw length between 15 and 20mm) so screw the two pieces together. Absolutely no support needed for the prints.
Print as is with supports on and stick it to your desired surface with double-sided tape.
*Will fit up to the the Costco brand toilet paper rolls which are big, feel free to scale it up or down to fit your needs.