NES Classic Mini with 4 Player Support

I am trying to figure out whether and how to get up to 4 Bluetooth controllers connected to the NES Classic Mini.

First off, I know there is very limited support for games supporting more than 2 players in simultaneous gameplay. NES and SNES titles are scarce, 4 controller support became common with N64. NES depended on the FourScore while the SNES required the Multitap iirc.

I have layed eyes on the Bluetooth adapters by 8bitdo, but I am not sure on how many controllers one adapter does support. I am very green with Bluetooth.

Does anyone have a running setup with a NES Classic Mini? What does your setup consist of? Thank you in advance!