Eyes and ears not direct connected on the ha-server?

newbie question: i have my ha installed on a proxmox server in the basement and would like to work with enocean (usb300), bluetooth and audio output for the doorbell in the apartment.
what is the standard procedure here? i have another rpi4 that i could use for this. should i then install another instance of ha on it and then connect the two together? or what is the standard procedure here? or is there some kind of guide for standard installations somewhere?

Use a Bluetooth gateway, Bluetooth - Home Assistant

yes, cool, remote adapter is what i need.
but for enocean, zwave and zigbee i have not found that.
is there such a thing as a proxy adapter?

For zigbee Tube’s Ethernet connected coordinators are the go:

If there’s a wait list it usually isn’t long (a week or so).

No idea about the other devices.