If you just want to play and aren’t collecting original dongles, you can get a cheap AliExpress memcard and use it as a multi-dongle for your 2x6 system. I got a PSxMemCard Gen 2 and it works great.
Info here:
This is pre-built sd card structure for
1.0.0-RC1 for SD2PS/PSXMemcardGen2 and will display the dongle name and version on the screen for easy identification.
- Instructions
_______________________________________
1. Flash sd2psxtd-
1.0.0-RC1.
2. Drag and drop [MemoryCards] folder from the drag and drop package to a MicroSD card.
3. Put MicroSD into a SD2PS/PSXMemcardGen2.
4. Deploy CIV in the menu under PS2.


5. Change the variant to arcade in the menu under PS2.
6. Use as you would like.
!!!! Remember to check the compatibility and I/O...