Bluetooth controller adapters are all one device each.
So you would need two adapters regardless of which you get. Thankfully theyre only $20
I’ve been looking into the receivers for a new snes mini / raspberry pi so I can tell you what I understood.
The first version of the USB wireless adapter has Bluetooth 2.1 and the “2” has Bluetooth 4.0 and works with PS5 and Xbox series controllers in addition to all older model controllers that do Bluetooth. I thought the 1 did the Xbox one controller, but it does seem to only list it for the 2.
I think the PS1 classic adapter is just the USB adapter 1 but in grey.
The “2” has a 2 on it, it doesn’t always show on the black one, I think they’re always using the wrong product pics? It usually shows on any buying page for the red brick one like https://www.amazon.com/gp/product/B0B9FZCXSV
There are pictures of the black 2 with the 2 on it, just never as the product pic. Maybe they only started putting the 2 on the newer ones?
I have the retro receiver classic (for the snes mini) and some Bluetooth controllers including the SN30 pro. The newer receivers I got from Amazon recently are grey with silver 6-point star screws and they’re different to the all black one with triwing screws that came with an older NES30 controller, but they do the same thing, so it does seem like 8bitdo changes the design a little bit sometimes.
The retro receiver classic is Bluetooth and plugs into the weird Wii controller plug that the NES and SNES classic consoles have on the front, but you can also use it via USB as it has a microUSB plug hole on the side (and comes with a tiny microUSB cable). As far as I know it’s basically the USB adapter 1 but you can plug it into the classic/mini Nintendo console controller ports. If I plug it into PC then it thinks it’s an xbox 360 controller. I think all the oldschool console receivers are the same idea.
I have an unused Xbox one controller lying around that I could try with the retro receiver later (when I’m not extremely hungover).
As far as I know the 2.4G 8bitdo controllers come with their own hard-coded receiver, yes.