After 5 different bluetooth adapters, I finally found one that lets me use two controllers at the same time with pademu! - Link included : r/ps2
Amazon.com: XBERSTAR for ps2 Bluetooth Adapter ps1 Bluetooth Adapter Wireless Controller Converter Controller Adapter Supports PS2 PS1 Game Console (White) : Video Games
Amazon.com: BITFUNX RetroScaler PS2/PS1 Wireless Controller Adapter - Supports PS2/PS1 Game Console, Compatible with PS3/PS4/PS5, Xbox One S, Series X/S, Switch Pro Bluetooth Controllers : Video Games
Blueretro Multiplayer Wireless Controller Adapter for PS2 PS1 Compatible with PS5 PS4 Switch XBOX One 8 bitdo Controller – Bitfunx
Blueretro Bluetooth-compatible Wireless Controller Adapter for PS1/PS2 (White) - Walmart.com
Blueretro Bluetooth-compatible Wireless Controller Adapter for PS1/PS2 (Blue) - Walmart.com
Amazon.com: XBERSTAR for ps2 Bluetooth Adapter ps1 Bluetooth Adapter Wireless Controller Converter Controller Adapter Supports PS2 PS1 Game Console (red) : Video Games
Amazon.com: XBERSTAR for ps2 Bluetooth Adapter ps1 Bluetooth Adapter Wireless Controller Converter Controller Adapter Supports PS2 PS1 Game Console(Blue) : Video Games
Blueretro Bluetooth-compatible Wireless Controller Adapter for PS1/PS2 (White) - Walmart.com
Blueretro Bluetooth Controller Adapter for PS2 PS1 Game Consoles Support Wii, Switch, PS4, PS5 Wireless Controller Clearance - AliExpress
Amazon.com: XBERSTAR for ps2 Bluetooth Adapter ps1 Bluetooth Adapter Wireless Controller Converter Controller Adapter Supports PS2 PS1 Game Console (White) : Video Games
PS UnoRetro Bluetooth Adapter - Connect Bluetooth Controllers to PS1 or PS2 Easily Tutorial (2021) - YouTube
Amazon.com: Kacenray Wireless Bluetooth Controller Adapter for PS1 / PS2 Console, Compatible with PS3, PS4, PS5, Xbox One S, Xbox Series X/S, Switch Pro, Video Game Converter to Playstation 1/2 System (Red) :
PS2 Controller Bluetooth Adapter for Android & iOS for PlayStation 2
Amazon.com: XBERSTAR for ps2 Bluetooth Adapter ps1 Bluetooth Adapter Wireless Controller Converter Controller Adapter Supports PS2 PS1 Game Console (White) : Video Games
MayFlash PS2 Controller Bluetooth Adapter for Andriod/iOS/PC (AD001) – SupremeGameGear
Playstation 2 Bluetooth Controller Adapter | Bluetooth Adapter Ps2 Bluetooth - Ps2 - Aliexpress
Mayflash PS2 Controller Bluetooth adapter for Android & IOS | eBay
Playstation 2 Bluetooth Controller Adapter | Bluetooth Adapter Ps2 Bluetooth - Ps2 - Aliexpress