Hello roemervtoorn,
It sounds like you want to know how many Bluetooth devices or accessories you can have connected to your Apple TV, and we'd like to provide some information.
"Your Apple TV 4K or Apple TV HD can support several Bluetooth accessories simultaneously, up to this many:
- One Siri Remote or Apple TV Remote*
- One Bluetooth keyboard
- Four MFi (Made for iOS) Bluetooth controllers (Unless you also connect a Bluetooth audio accessory. If so, you can connect only one MFi controller).
You might be able to pair more accessories, but at some point you may need to unpair others to allow for new ones. Some apps let you use an iOS device as an additional controller, which doesn't require Bluetooth. For help using an iOS device as a controller in an app, contact the app developer."
You can find more information about using more than one Bluetooth accessory under the "Use more than one Bluetooth accessory" part of this page: Use Bluetooth accessories with your Apple TV
For more details on connecting Bluetooth devices to your Apple TV, please check out this link as well: Connect Bluetooth devices to Apple TV
Thanks!