Hi Roberto, Welcome,
… link please … there’s many different kinds, are they wifi or zigbee (guessing wifi)?
I’m using a cc2531 that I got from a different thread
and I’m using it with zigbee2mqtt which has a lot of cheap supported devices. I’m very happy with that setup.
As for for Raspberry pi4, from what I read, I think it’s a good choice (I have a 3b+ and a little bit of extra speed would be good). I’d consider changing your sdcard for a “Samsung pro endurance” card, or some other card meant for continuous writing. Some people have USB-sata adapters and SSD instead of an SD card, I don’t have a raspberry pi4 to test and I hear there are some issues with USB mass storage on rpi4 because it’s new and booting from USB is complicated on rpi4.